jizz biscuit Share definition Flag The biscuit which a small group of usually younger males masturbate in a circle onto as a game. The loser in the game is the last one to ejaculate and must eat the biscuit. James looked at the jizz biscuit and thought 'No way'. jizz biscuit by TonyM June 24, 2005 Get the jizz biscuit mug.