Definitions by b.diesel

rusty beercap 

An unforeseen brown asshole that feels good upon penetration but rips your cock off on the way out. Post penetration, you will indeed require a tetanus shot.

I thought I was gonna get inside that girls brown eye, but instead I got into her rusty beercap and now my cock is missing.

rusty beercap by b.diesel May 15, 2014