Korean Slang Words and What They Actually Mean
Korean slang is mostly built two ways: short reactions you shout at a screen (대박, 헐, 진짜?), and chopped-up compounds that squeeze a whole sentence into two syllables (노잼 = "no fun," 심쿵 = "my heart just stopped"). Once you know which machine made a word, you can usually guess a new one on sight — which matters, because Korean slang turns over fast and no list stays complete. Below are the ones that have outlasted the trend cycle, grouped by how they work, with a note on who you can actually say them to.
- 대박 (daebak) — "whoa, huge." Good news or bad news, both.
- 헐 (heol) — "wait, what." The sound of being blindsided.
- 짱 (jjang) — the best, the top.
- 완전 (wanjeon) — "totally," dropped in front of anything.
- 사이다 (saida) — a scene that finally gives you satisfaction.
- 고구마 (goguma) — a scene that makes you want to scream.
- 노잼 (nojaem) / 꿀잼 (kkuljaem) — boring / hilarious.
- 인정 (injeong) — "agreed," "facts."
- 최애 (choeae) — your absolute favorite, your bias.
대박, 헐, 짱, 완전: the four you hear in episode one
대박 (daebak) originally meant a jackpot — a huge win. As slang it just means "that's enormous," and Koreans use it for a lottery win and a car crash with the same face-first energy. Length carries the meaning: a short 대박 is "nice," a stretched 대애애박 is "I cannot believe this."
헐 (heol) is not a word so much as an exhale. It covers the half-second before you have processed news. English "what?!" is close, but 헐 is more passive — you are not asking a question, you are reacting.
짱 (jjang) means the best or the top, and it also works as a suffix: 얼짱 (eoljjang) is "best face," 몸짱 (momjjang) is "best body." It has been around since the 90s, so it now reads slightly warm and dated to Koreans in their twenties — charming from a foreigner, not cutting-edge.
완전 (wanjeon) technically means "completely," and in slang it bolts onto anything to crank it up. 완전 맛있어 (wanjeon masisseo) — "this is so good." 완전 내 스타일 (wanjeon nae seutail) — "completely my type." If you learn one intensifier, learn this one, because unlike the rougher options further down it is safe in almost any company.
Them: 이거 봐, 대박이지? — igeo bwa, daebagiji? — "Look at this, insane right?"
You: 헐, 완전 대박. — heol, wanjeon daebak. — "Whoa, that's wild."
Them: 그치? 짱이야. — geuchi? jjangiya. — "Right? It's the best."
Practice this out loud with SULSUL — the app says it, you repeat it →
사이다 and 고구마: the two words a K-drama fan needs most
These two get their own section because no dictionary will explain them and every Korean comment section runs on them.
고구마 (goguma) is a sweet potato. Eat one dry, with nothing to drink, and it lodges in your chest. That feeling — stuck, stifled, unable to breathe — is what Koreans call a 고구마 전개 (goguma jeongae), a "sweet potato plot": the heroine says nothing while she is being wronged, the misunderstanding drags for four more episodes, and you are yelling at your screen.
사이다 (saida) is the lemon-lime soda you would have wanted with that sweet potato. A 사이다 전개 is the release — the moment the quiet character finally speaks, the villain gets caught, the resignation letter lands on the desk. Fans describe an actor as 사이다 같은 캐릭터 (saida gateun kaerikteo), "a character like soda."
You: 이 드라마 너무 고구마야. — i deurama neomu gogumaya. — "This drama is so frustrating."
Them: 8회 봐, 완전 사이다. — 8hoe bwa, wanjeon saida. — "Watch episode 8, it's pure payoff."
Two more that live in the same conversation. 케미 (kemi) is clipped English "chemistry," used for any pairing: 케미 좋아 (kemi joa), "they have great chemistry." And 썸 (sseom), from English "something," is the talking stage — not dating yet, definitely not nothing. 썸 타는 중 (sseom taneun jung) means "we're in that stage." If arguing about what a finale meant is your natural habitat, Korean phrases when fans debate a K-drama ending has the rest of that vocabulary.
The chopping machine: how new slang gets built
Most modern Korean slang is an abbreviation. Koreans take the first syllable of each word in a phrase and staple them together, and the result is unguessable until someone shows you the seam. Once you see the seam, the whole category opens up.
| Slang | Romanization | Built from | Meaning |
|---|---|---|---|
| 노잼 | nojaem | no + 재미 (fun) | boring, not funny |
| 꿀잼 | kkuljaem | 꿀 (honey) + 재미 | hilarious, great fun |
| 심쿵 | simkung | 심장 (heart) + 쿵 (thud) | heart-stopping cute |
| 최애 | choeae | 최고 (best) + 애정 (affection) | absolute favorite, bias |
| 입덕 | ipdeok | 입 (enter) + 덕후 (fan) | falling into a fandom |
| 갑분싸 | gapbunssa | 갑자기 분위기 싸해짐 | the mood suddenly froze |
| 얼죽아 | eoljuga | 얼어 죽어도 아이스 아메리카노 | iced americano even in winter |
| 답정너 | dapjeongneo | 답은 정해져 있고 너는 대답만 | you already decided my answer |
Look at 갑분싸. It is four words — 갑자기 분위기 싸해짐, "suddenly the atmosphere went cold" — reduced to three syllables, and it is the single most useful word for describing a joke that did not land. 얼죽아 is even better as proof of the pattern: a full sentence about ordering iced coffee in freezing weather, folded into three syllables, now a personality type people claim about themselves.
최애 is the one you will use most as a fan. It means your number-one — your bias — and it has a sibling, 차애 (chaae), for second place. 입덕 is the moment you fell in, 탈덕 (taldeok) is the moment you left, and 덕후 (deokhu) — a Korean respelling of Japanese otaku — is the fan themselves. Calling yourself a 덕후 is affectionate; calling someone else one is a gamble. The concert-floor versions of these are in Korean fan phrases to know at a K-pop concert.
Korean slang in texting: the consonant shorthand
Korean typing slang strips words down to their initial consonants, so a message can look like it has no vowels at all. It is not a code — it is exactly how the letters sit on a Korean keyboard.
| Typed | Full word | What it means |
|---|---|---|
| ㅋㅋㅋ | 크크크 | laughing; more ㅋ = harder laugh |
| ㅎㅎ | 하하 | softer, friendlier laugh |
| ㅠㅠ / ㅜㅜ | — | crying eyes |
| ㅇㅇ | 응응 | "yeah, yeah" |
| ㄱㅅ | 감사 | thanks |
| ㅈㅅ | 죄송 | sorry |
| ㅇㅈ | 인정 | agreed, facts |
| ㄹㅇ | 리얼 | for real |
| ㅊㅋ | 축하 | congrats |
One live rule worth knowing: ㅋㅋ counts. A single ㅋ can read as cold or sarcastic, ㅋㅋ is neutral, ㅋㅋㅋㅋㅋ is genuinely amused. And 인정 written out loud, not abbreviated, is a full conversational move — someone makes a point, you say 인정 and that settles it. The longer messaging conventions, including who you can send ㅇㅇ to, are in Korean phrases for KakaoTalk texting.
개- and 존-: stronger than the subtitles suggest
Korean has intensifiers that mean "extremely" and carry baggage. 개 (gae) is literally "dog," and prefixed to an adjective it means "super": 개맛있어 (gaemasisseo), "insanely tasty." Young Koreans use it constantly with friends. It is still crude. Said in front of a boss, a professor, or anyone's parents, it lands like swearing.
존맛 (jonmat), often typed as JMT, means "unbelievably delicious," and its first syllable comes from a vulgar root most Koreans no longer think about. Same rule applies: everywhere online, never at a company dinner.
The safe swap is the one from earlier — 완전. 완전 맛있어 gets you the same enthusiasm with none of the risk, and 진짜 (jinjja), "really," works identically. When you do not know the room, use those two. The full ladder of who gets which speech level is laid out in how to greet someone at different Korean politeness levels.
Where slang goes wrong for learners
Using slang up the age ladder. Almost every word on this page is 반말 territory — casual speech for friends and people younger than you. Slang plus a -요 ending does not fix it; 대박이에요 to a client still sounds like a teenager. Fix the relationship first: Korean family titles: how to address people in Korea covers who you are allowed to be casual with.
Reaching for the newest word. Slang from this year, used slightly wrong, marks you faster than slang from ten years ago used correctly. 대박 and 완전 never sound bad. A trend word you picked up from one clip often does.
Saying 헐 as "hull." It is one short syllable, closer to huhl, cut off fast. Stretched out, it stops being a reaction and becomes a performance.
Translating 사이다 as "cider." Korean 사이다 is clear lemon-lime soda, not apple cider. Order 사이다 in a restaurant and you get Sprite.
Collecting instead of speaking. Reading forty slang words is an afternoon. Producing 완전 고구마야 at the right beat in a real conversation, without a two-second delay, is a different skill — and it is the one that makes a Korean friend answer you in Korean instead of switching to English. The everyday lines that surround this vocabulary are in common K-drama phrases to use in conversation.
Say it out loud before you need it
Slang has no thinking time built in. 헐, 대박, 인정 either arrive in the first half-second or they arrive too late to be a reaction at all.
SULSUL is a speaking gym for exactly that gap: pick a pattern, say it out loud, get an instant fix from the AI pronunciation coach, then run the real situation as a mission. The 100-pattern PDF workbook comes along as a bonus.
