A person, generally of the lower class.
Devout fans of Korn, ICP,
Slipknot, Mudvayne, and Disturbed.
Fans of baggy jeans, sometimes, if they can afford a pair, they like to wear the pants with chains and zippers aplenty, they enjoy a pair of jean shorts with black socks that disappear into the bottoms of these jean shorts.
A dirthead
will sit cross-legged in the dirt across from the school or at a party and piece a refry(or half cigarette) between their group of 5 or 6 smelly friends.
They
will generally call this refry a cigarette, and
will rarely have a whole one of their own.
Shane is the dirthead ambassador.
somebody dropped the remains of a cigarette on the ground, next to
Shane's half drank beer.
Shane goes to grab his beer and says, "dude! A cigarette!!!"
Has no idea where the cigarette came from and proceeds to smoke it.