A strong odour coming from one's behind.
Trevor just let out a huge butt funk
ayon kay Bob Sachet ika-18 ng Abril, 2006
Term used to describe one’s foul odor emitting from the anus. Also used to describe other foul odors not necessarily relative to the butt.
Stan reeks of butt funk because he's dirty.
ayon kay Dominic5160 ika-14 ng Abril, 2006
the unpleasant aroma that eminates from the crack of an unwashed buttock
bitch you need to wash that buttfunk from yo ass!!!
ayon kay crazy68 ika-31 ng Agosto, 2009