Gâche Share definition Flag An alternative spelling for the word Gash; a term for the female genitalia, implying that it looks like a hatchet wound. "Nice gâche""Man, that is a nasty gâche""Get your gâche out""Flash your gâche" Gâche by GuernseyGache September 24, 2009 0 0 Get merch Get the Gâche mug. Buy Now — $32.95 See more merch