Mosher in general means someone who prefers to wear things that dont have to come of a high priced label like Nike or Reebok and are constantly in an all out war with Townies Kev's Tegger's or Scally's. For most of a Moshers life He or She will be called one during their life we prefer diferent music and clothing get bloody over it.
Townies in internet chat rooms tend not to be able to spell using insults like shumt the fumnkup or you phyco none of them can type worth a damn.
(At a large party at night)
Townie: "Ooo mosha whats your name."
Me: "Me why Im the thing that goes bump in the Night". *Pushes over and walks by*