Pee Pee Sprout Share definition Flag A young male's penis not fully developed into a cock yet. a very small penis. Litte Billy pulled out his pee pee sprout and pee'ed on the floor. Pee Pee Sprout by Funky Wagner August 30, 2009 0 0 Get merch Get the Pee Pee Sprout mug. Buy Now — $32.95 See more merch