“Gachi” is a short form of “gachinko.” The etymology of “gachinko” is said to be the sound (“gatsun”) of two sumo wrestlers clashing violently on the arena. Originally, it meant a “serious match” and “heated battle.” “Gachi” recently replaced “maji” (= “in earnest” and “seriously”) which had been used colloquially, and gained popularity among young people (especially in their 10’s and 20’s).
“Being on a gachi diet” means “being on a diet seriously.”
“Having a gachi match” means “having a battle seriously.”
1. Wakai dansei doushi no kaiwa.
A：Ima nan ji?
A：Uwa, yabee（＝yabai）! Isoganee（＝Isoganai ）to gachi de okureru!
B：Nani? Korekara nani ga aruno?
A：Kanojo to deeto! Konoaida chikoku shitara, gachi de kirerareta.
2. Koibito doushi no kaiwa.
Woman：Mou, osoi yo! Gachi de. Honto kanben shiteyo.
Man：Honto ni gomen!! Kyou wa yakiniku ogoru kara sa.
1) [Conversation between young males]
A: What time is it now?
B: 3 o’clock.
A: Yikes, yabee (= yabai = dang)! Isoganeeto (= isoganaito = I gotta run, otherwise) I’ll be gachi late!
B: What? You’ve got an appointment or something?
A: Got a date with my chick! The last time when I was late, she got gachi angry.
Example 2) [Conversation between lovers]
Male: Sorry, I’m late!
Female: Yep, you’re gachi late! I can’t take it any more.
Male: My apologies, really!! Tonight’s barbecue is on me.
Female: It’s better be!
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