Brownie Gun Share definition Flag The human tuckus (a.k.a. butt). Plain and simple. That fart came out of Johnny's brownie gun so loud and obscure that Bill Cosby asked if there was a load in his pants Brownie Gun by The_Buddy November 24, 2010 0 0 Get merch Get the Brownie Gun mug. Buy Now — $32.95 See more merch