When you poke someone in their hinder hole when they least expect it. Works best when an individual is under a table. The ensuing reactive jump from the "pooperpoke" should cause the victim to jump and drive their head into the bottom of the table.
I caught Joe under the desk picking up a pencil and I pooperpoked him. He now has a concussion.
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).