A name to explain what a stinky person's room smells like, or even how to explain how the person smells. (perhaps someone who wears no deoderant) Even sometimes used to explain a pig or donkey's stench.
Actual Example with dif. names:
Chris: EWW! it smells like buttass in here! where's the Lysol????!!?!?!
Bob: In the bathroom!!!
Probably the most harmless insult ever conceived by the English language. It combines two insults that aren't offensive into one supreme inoffensive word. Make fun of anyone who says this seriously.
Bill: Stop being such a Buttass, Tom!
Tom: Did you seriously call me a fucking Buttass. Go die.