THE GREAT CORNHOLIO

What's the definition of Cornholio?

Cornholio emerges whenever Beavis consumes large quantities of sugar or caffeine or other stimulants and enters a hyperactive phase, with symptoms including convulsing, nonsensical jabbering and gazing cross-eyed at his fist. The final transformation is usually triggered by mention of vaguely Hispanic-sounding words: he pulls his shirt over his head (producing a makeshift hood covering his hair) and begins marching around randomly, his hands at either sides of his face with palms forward, making loud proclamations in a quasi-Spanish accent. This could be interpreted as a reference to Psycho, in which Norman Bates becomes "Normal" after consuming large quantities of alcohol and passing out.

Cornholio apparently hails from Latin America, claiming his home to be both Nicaragua and Lake Titicaca (the latter word already providing amusement to Beavis). He states his mission in life is to find "TP" (toilet paper) for his "bunghole" (anus), as his "people" are "without bungholes". This apparent contradiction is typical of the nonsense he frequently spouts: at other times he claims he himself is a bunghole, he has no bunghole, he is a gringo (which is actually true, as he has blonde hair), or calls upon "the Almighty Bunghole" (either himself or his god). He has also expressed an interest in oleo, presumably because it rhymes with his name; he combines it with "bunghole" to create his most famous cry, "bungholeo-o-o-o-o!".
Cornholio is a very different personality to Beavis in one particular aspect: while Beavis is somewhat shy and prone to mumble, Cornholio is extremely forceful and loud. If anyone challenges him, he demands to know "are you threatening me?", and on many occasions he has warned "unbelievers" of the "wrath" of his bunghole. Although generally he means no harm, he respects no boundaries or property rights and roams wherever he wishes on his quest, frequently screaming at those he meets and terrifying them into submission. He is one of the few characters that actually sings (apart from the teacher Mr. Van Driessen), but his singing is off-key, and he sings only about what he talks about: his bunghole.

Beavis seems to retain no memories of events after he returns to "normal", on one occasion seemingly apologizing to Principal McVicker for having caused a problem. This indicates that Beavis suffers from multiple personality disorder. However, sometimes the two personalities collide: as Cornholio, Beavis can sometimes be heard muttering in his normal voice, usually before the phase has finished. Beavis also does impressions of Cornholio.
The name "Cornholio" is a reference to the anus, which is sometimes called the "cornhole"; the traditional meaning of "bunghole" is a hole in a liquor barrel or keg.
(reference: Wikipedia)