bitch toothpaste Share definition Flag the mythical frothy mixture between semen and urine. if a man could blow his wad and piss at the same time, the resulting liquid would be called bitch toothpaste. bitch toothpaste by danny69 January 21, 2006 0 0 Get merch Get the bitch toothpaste mug. Buy Now — $32.95 See more merch