Browie Gun 

Noun: your asshole

I'm take my foot and shove it up your browie gun!

Browie Gun by Man in the mirror December 3, 2009

Brownie Gun 

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