Refers to quite possibly the coolest type of guy on the face of the earth. He's universally loved, so much that they can call him "dirt," still love him, and he totally gets away with it. He is usually accompanied by a beautiful cat, which only makes him that much more sweet. Anyone able to get away with such strangeness obviously deserves such an exalted name.
Holy crap! Did you see that guy standing naked in the party? He's totally Dirt!