Used in a sentence typically constructed as "You're making an ass out of yourself". It means that the target is making himself seem foolish or that he is embarrassing himself.
"Josh is always making an ass out of himself when he's had too much to drink"
"Hey Josh! Stop making an ass out of yourself!"
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).