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ガチ gachi
For real. Seriously.
What does gachi mean?
The no-joke intensifier. Stick it in front of anything to promise you are not exaggerating, even when you are.
Example
今日のテスト、ガチで難しかった。
Today's test was seriously hard.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind gachi
Gachi is short for gachinko, and gachinko comes from the sumo world, where it described a bout fought for real rather than arranged in advance. The word itself is said to imitate the sound of two enormous bodies colliding, which tells you everything about the register it started in.
Television carried it out of the stables and into ordinary speech around the turn of the millennium, and once it was loose it shrank. Gachi now bolts onto anything: a gachi fan, a gachi apology, gachi hungry. The irony is that it is used most often by people exaggerating, which is exactly what it promises not to be doing.