Japanese youth slang evolves fast, but some words have become so embedded in everyday speech that even grandparents recognize them. Whether you want to understand anime, social media, or conversations with young Japanese people, learning these terms will transform your comprehension. This guide covers the most important 若者言"葉; (wakamono kotoba, youth language) with honest explanations of how and when each word is actually used.
| Word | Original Meaning | Slang Meaning | Vibe |
|---|---|---|---|
| やばい (yabai) | dangerous / bad situation | awesome / terrible / intense (context-dependent) | Extremely versatile; generation-defining word |
| 草 (kusa) | grass / plants | LOL / that’s funny (from “w” = warai) | Text/social media slang; replaces haha |
| エモい (emoi) | emotional (from English) | nostalgic / sentimental / moving | Gen Z favorite; describes a feeling that hits deep |
| いけてる (iketeru) | can go / is going | cool / attractive / stylish | Positive; used for people, fashion, design |
| むじ (muji) | (brand name) | plain / unbranded / boring (sometimes) | Casual description; not always negative |
Yukaやばい (yabai) is the word you will hear the most. It started as a word for ‘dangerous situation’ but now means almost anything intense: amazing food, a scary movie, a cute puppy, a stressful deadline. Context is everything with this one!
やばい (Yabai): Japan’s Most Flexible Word
やばい started as a word meaning “dangerous” or “sketchy” but has expanded to cover virtually any strong reaction. Young Japanese people use it the way English speakers use “wild,” “insane,” “amazing,” or “awful” depending on tone.
| Context | Example | Meaning |
|---|---|---|
| Amazing food | このラーメんやばい！ | This ramen is insanely good! |
| Scary movie | あのシーンやばいよね。 | That scene was terrifying, right? |
| Stressful situation | 明日紙准のやばい。 | Tomorrow’s deadline is brutal. |
| Something cute | この秘やばくない？ | Is this cat not just too cute?! |
| Surprised reaction | やばい、もうそんな時間か。 | Whoa, it’s already that time? |
草 (Kusa): Laughing in Text
The slang term 草 (kusa, grass) is used online to mean “that’s funny” or “LOL.” The origin: “w” is the Japanese abbreviation for 笑い (warai, laughter). Repeating it — “wwwww” — looks like grass (草). So 草 on its own became a shorthand for “so funny it turned into a field of w’s.”
| Text/Post | Meaning |
|---|---|
| それ草 | LOL / haha that’s funny |
| 草生えてる | Growing grass = dying of laughter |
| w | heh / mild laugh (single letter) |
| wwwww | Hahahaha (stronger laugh) |
エモい (Emoi): That Deep Nostalgic Feeling
エモい comes from the English word “emotional” but carries a specific Japanese nuance: a bittersweet, nostalgic, or deeply moving feeling. It is similar to the Portuguese “saudade” or the Japanese concept of もののあわれ (mono no aware).
| Japanese | Romaji | English |
|---|---|---|
| この画番エモい液。 | Kono gazo emoi ne. | This photo gives such a nostalgic/bittersweet feeling. |
| 本当にエモい曲だ。 | Hontō ni emoi kyoku da. | This song is genuinely moving/emotional. |
| あの時代のアニメはエモいから。 | Ano jidai no anime wa emoi kara. | Anime from that era has that deep nostalgic quality. |
Reiエモい is used by young people (teens to 30s) the most. If you use it with older Japanese speakers, they might not recognize it. But in online communities, anime discussion, and Gen Z conversation, it comes up constantly — especially when someone shares an old photo or childhood memory.
More Essential Youth Slang: Quick Reference
| Slang | Reading | Meaning | Usage |
|---|---|---|---|
| でしかし、 (deshikashi) | deshikashi | Even so / but still (casual concession) | “だけど、でしかし、やっぱりやつぶい。” — Still though, it’s tough. |
| でも刏 (demori) | demori | Lots of extra serving (from de-mori, large portion) | Describes generous extra helpings at restaurants |
| ありかの (arikano) | arikano | Basically / pretty much (from ありがとう + の) | Casual acknowledgement, “pretty much, yeah” |
| いいにおい (ii nioi) | ii nioi | Smells good (extended to “good vibe/energy”) | “あの子いいにおいがする。” — That person gives off good vibes. |
| うける (ukeru) | ukeru | Funny / that’s hilarious (lit. to receive) | “うける！” = That’s so funny! / LOL |
| ぎりぎり (girigiri) | girigiri | Just barely / cutting it close | “ぎりぎり間に合った。” — Just made it in time. |
| むりる (muriru) | muriru | Over-indulging / pushing too hard | Coined from むり (muri = impossible) + る verb ending |
| がちい (gachii) | gachii | Seriously / for real (from がち = real/genuine) | “がちいいい！” = That’s seriously good! |
Yukaがち (gachi) and がちい (gachii) are huge right now. がち comes from sumo/sports meaning ‘a real match’ vs a scripted one. Now it just means ‘for real.’ “がちいまじ？” = Are you seriously kidding me? is a very common young person’s exclamation!
Slang to Avoid in Formal Settings
All the slang above is casual speech. Using it in job interviews, business meetings, or with elders is inappropriate. Here is what to use instead in formal contexts:
| Slang | Formal Alternative | Meaning |
|---|---|---|
| やばい | 秘悪しい / 秘悪い | amazing / terrible |
| エモい | 感動的な | moving / emotional |
| がちい | 本当に | seriously / really |
| うける | 難しい / おかしい | funny |
Quick Quiz
1. What does 草 mean in a text message?
→ LOL / haha / that’s funny (from wwww = grass shape)
2. If someone says “このラーメんやばい！” are they complaining or complimenting?
→ Complimenting — やばい here means “amazingly good”
3. What English word does エモい come from?
→ Emotional
4. Would you use やばい in a job interview?
→ No — use formal alternatives like 秘悪しい or 強影を受けた
Want to use these words naturally in real conversation? Practice with a Japanese tutor on italki and get instant feedback on how you sound.
Which slang word surprised you most? Or do you have a favorite youth slang word that is not on this list? Share in the comments — we love hearing what words our readers are encountering!
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