dirtgirt

A person, usually male, who is dirty, awkward, sneaky, dorklike, or cannot surf well. They tend to wear gnar-gnar shred brands to disguise their lack of talent. Dirtgirts do not shower often, and generally have no interest in following social norms.

Alternate definition: A dirty ole girt bag

someone who doesnt give a fuck. skateboards or does some extreme sports. usually doesnt fit in with the "croud". kickin it with some beer and buds.