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42 JK Slang Words: Japanese High School Girl Slang, Current and Retro

JK stands for joshi kosei, a high school girl, and "JK slang" is the playful, fast-changing language that spreads from high school girls through texts and social media. Girls use "JK" about themselves, but some people feel uncomfortable when adults use it, so as a visitor the neutral word is koko-sei (high school student). This page mixes words you'll hear today with dated ones and retro classics from the 1990s and 2010s, all clearly labeled, because you'll still meet them in dramas, manga, and jokes.

📝 Before you start
  • Check the label in each note: current, a bit dated, or retro. A retro word used seriously gets you laughed at; the same word used as a joke can be a hit.
  • Much of this lives in texts and chats, not speech. Short forms like ri or china are rarely said out loud.
  • Boys use plenty of these too. "JK slang" names where the words took off, not who owns them.
  • Never use this slang with teachers, shop clerks, or older people you don't know well.
  • A lot of Japanese youth slang goes back to gyaru culture in the 1990s and 2000s, so knowing a few retro words helps you understand the new ones.

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