a greebo is someone who listens to heavy metalmusic (eg. system of a down, slipknot, korn), wears baggy trousers, usually jeans, wears hoodies and shirts showing their band name, and have long, overgrown hair
townie: yeah innit u f***in greebo, you, like, worship the devil, innit? show me your pockets like. whatsup? wat u walkin away for? r u talkin to me? innit!