Gun-Butt 

When a person hits someone else with the bottom of their gun.

“Won’t shoot her but I will gun-butt the bitch.” -Nicki Minaj, Barbie Tingz

Gun-Butt by Newport Shorty May 27, 2018

butt gunner 

A butt gunner is a gay homosexual who likes to be gunned in the butt (aka poked in the pooper, pounded in the ass, butt-fucked, etc...). In other words a homosexual male.

Gee Ted, that new guy Ted sure seems like a real butt gunner

butt gunner by jimmy browntooth July 31, 2004

Buttgun 

A penis, in prison it is reffered as a buttgun. Shooting the semen into the butt of another male.

Bend over and let me show you my buttgun!

Buttgun by gordon freeman 29999 November 29, 2011