bi-five Share definition Flag A hi-five between bisexuals. Usually given shortly after they meet upon discovering they are both bisexual. Guy: Oh, by the way, I'm bisexual. Girl: Hey, so am I! Guy: Bi-five! bi-five by Periwinkle SC October 7, 2010 0 0 Get merch Get the bi-five mug. Buy Now — $32.95 See more merch