Barney, the old fart.

Barney is a two hundred million year (two dinosaur years) old violet tyrannosaurus rex with a green stomach. Being an old fart, he is only seen as a cameo appearance in Return Of The Plumber, where he hugs Beavis and Butt-Head.

Some fans know that Barney might be called "Bawn", "Barn", "Dirty Fred", or "Pinhead Elmo".