A person, who, by an unnatural process of the human body, floweth crap out of the mouth and speaketh unintelligible words out of his bottom. These words are often accompanied by an unpleasant smell, and the crap that floweth out of the mouth can also flow onto online sites such as forums, IRC chat sites and social networking sites such as Farcebook and Twitter.
Josh: "Beavis is a butthead."
George: "How so?"
Josh: "Because crap comes out of his mouth and noise outta his back, that's how."