koos Share definition Flag the middle eastern word for pussy.not to be mistaken for cous cous. it is a rather vulgar way to describe the vagina. lad: yo bitch, blow me chick: naaah kid not before you kiss my koos koos by Bad Man Clint July 22, 2007 0 0 Get merch Get the koos mug. Buy Now — $32.95 See more merch