A variation of "Joe Schmoe", this term is used for someone who inserts their opinion when not asked. Additionally, this person thinks they know what they're talking about, even though they have no experience or knowledge on most subject being discussed. You might say a Joe Jerk Off is a member of the Peanut Gallery.
Guy #1: Do you hear this guy talking about shit he knows nothing about?
Guy #2: Yeah, he's a real Joe Jerk Off
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).