butt wind 

A fart from someones ass.

Yo that dude had some nasty butt wind

butt wind by massive matt July 27, 2003

Butt Wind 

When you fart but it's got no smell.

Person-1:"ewww!! The guy next to me just released some butt wind!!"
Person-2:"at least it ain't smell like shit."

Butt Wind by That One Sexy Ho January 15, 2018