A teenage subculture.
A mosher is a person who generally hangs out with other moshers, and sometimes emos and goths. They hate chavs and visa-versa, but try to aviod them. They wear generally dark clothing, usually baggy jeans and a black hoody with a band logo on it. They listen to mostly heavy metal, and mosh to it (hence the name mosher). They do take baths, don't cut their wrists.
Most of the have long or moderatly long hair
A mosher hears a bunch of chavs approaching from around the otherside of the street, singing some random crap. Mosher quickly flees down another road to aviod the yobs. (true story)