What does butt whiff mean?

butt whiff meaning in Urban Dictionary

The foul -- yet occasionally pleasant -- smell that produces from behind of a person who, generally, is unacquainted with the problem. Take note, though, that is not comparable to a fart, but alternatively caused by untamed butt-cheeks which contain the remnants of doody, old hairs, weasels along with other things that gain smelly-momemtum as we grow older.