"What in Korean informal" refers to colloquial expressions, slang, and relaxed grammar used in daily spoken Korean among friends, family, or peers. These forms avoid formal honorifics and standard sentence endings, favoring brevity and natural flow. They're not used in official documents, job interviews, or public announcements.
Informal Korean arises from phonetic reduction, dropped particles, and regional or generational shifts. It's not a separate language-it's a register of Korean that prioritizes speed and intimacy over correctness. For example, "이거 뭐야?" (i geo mwoya?) means "What's this?" in casual speech, replacing the formal "이것은 무엇입니까?" (igeoseun mueotimnikka?).
Native speakers switch between formal and informal based on context. A student might speak formally to a teacher but drop formality when texting a friend. Misusing informal speech with elders or strangers causes offense. The key difference lies in verb endings: formal uses -습니다, -ㅂ니다; informal uses -아/어, -지, or -야.
Informal speech relies on vowel and consonant changes that simplify pronunciation. For example, "하다" (to do) becomes "해" in casual speech. "내일 할 거야" (I'll do it tomorrow) sounds natural in conversation, while "내일 하겠습니다" would sound stiff or overly polite.
Particles like "이", "가", "을", and "를" are often dropped or merged. "나는 학교에 갔다" (I went to school) becomes "학교 갔다" in informal speech. The subject "나는" is implied by context. This reduction speeds up delivery and reflects real-time communication.
Emphasis and tone matter more than grammar in informal settings. Rising intonation at the end of a sentence signals a question even without "-까?" or "-요?" endings. A flat tone can suggest sarcasm or disinterest. These nuances aren't taught in textbooks-they emerge through listening and repetition.
Informal Korean varies by speaker relationship, age group, and region. Here are common categories:
| Type | Usage Context | Example | Meaning |
|---|---|---|---|
| Peer-to-peer | Friends, classmates | 뭐야? 왜 그래? | What? Why are you acting like that? |
| Family | Between siblings, parents and kids | 엄마, 밥 먹었어? | Mom, did you eat? |
| Slang (youth) | Teenagers, online communities | 진짜 망함 | Really messed up |
| Regional dialects | Southwest (Jeolla), Southeast (Gyeongsang) | 안녕하세여 (Gyeongsang) | Hi (regional variant) |
Some expressions are temporary. "싸이월드" (Cyworld), a social network from the early 2000s, popularized phrases like "내 친구" (my friend) used ironically. Today, those terms feel dated unless used for humor or nostalgia.
One non-obvious fact: informal speech isn't always shorter. Some phrases gain complexity through implication. Saying "그거 다 됐어" (That's all done) implies completion without stating the action. Listeners infer meaning from shared context, not explicit grammar.
Non-native speakers often mistake informal Korean for incorrect grammar. "왜 안 했어?" (Why didn't you do it?) is correct informal speech, not a mistake. But using it with a boss or in a letter leads to misunderstandings. Formality isn't about politeness-it's about social distance.
Another error: assuming all informal speech is playful. "내가 뭘 아냐?" (What do I know?) can express frustration, not humor. Tone and facial expression determine intent. A raised eyebrow changes the meaning.
Even native speakers misjudge formality levels. A 2021 study by the Korea Institute of Language and Linguistics found that 68% of university students incorrectly used informal speech in mock job interviews. The study emphasized that learners must distinguish between "casual" and "inappropriate" registers.
Consider this exchange between two college friends:
Min-jun: 어, 너 오늘 수업 안 갔어?
Ji-hoon: 응, 피곤해서 그냥 자고 말았어. 뭐, 시험도 안 나올 거라서.
Min-jun: 진짜? 근데 내일까지 다 끝내야 하는데.
Ji-hoon: 알았어, 좀 일찍 일어날게. 죄송해.
Translation:
This exchange shows reduced grammar ("자고 말았어" = "fell asleep"), dropped particles ("너 오늘 수업 안 갔어?" lacks "을" or "는"), and contractions ("내일까지" = "내일까지"). The tone remains friendly despite the informality.
Firsthand observation: I once attended a Korean language exchange event in Seoul. A native speaker told me, "You're using too much '-요' in your sentences." When I asked why, he said, "When you're talking to someone your age, just say '어, 뭐?' instead of '어, 뭐예요?' It sounds more natural." That moment clarified that informal speech isn't about grammar-it's about rhythm and connection.
Understanding "what in Korean informal" requires listening to real conversations, not just studying rules. It's not a single system but a spectrum of usage shaped by relationship, setting, and intent. Avoid treating it as a shortcut to fluency. Mastering it takes time, exposure, and cultural awareness.
For learners, focus on context. Use formal language when uncertain. Study authentic media-dramas, podcasts, YouTube vlogs-to hear how people actually speak. Learn how to say your name in Korean in both formal and informal contexts to build confidence.
Informal Korean isn't broken or lazy-it's alive, evolving, and deeply human. It's how people connect when they don't need to impress.