k.m.a. Share definition Flag This term is a self-coined abbreviation for "kiss my ass" which everyone realizes as soon as they're hit with it. "You're gay". "Whatever, your mom's gay. So k.m.a." k.m.a. by tha mizzle February 27, 2008 0 0 Get merch Get the k.m.a. mug. Buy Now — $32.95 See more merch