When people pretend to be extremely liberal on the internet. Generally people who are libposting adopt a fake persona that is offended by everything and is extremely politically correct.
I was talking about Thanksgiving on the internet when this guy called it "Thankstaking" and went on a rant about how evil a holiday it was. As I was about to respond, he said he was just libposting.
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).