A person who refuses to live their life according to the prep mold (abercrombie, american eagle, Blink 182, etc.) and styles their own personality. They don't all wear black clothing, and they are not all outcasts. Most just don't want to be a dumb jock or pinhead cheerleader. Anti-preps dress and act how they want, not how the popular kids dress and act, but they can still be popular. Not all shop at the Salvation Army store. And above all, they are not anti-prep because they cannot find friends with the more popular, athletic, intelligent, and skillful people. In fact, there is no one on this planet who is all four of those things.
Anyone who thinks that anit-preps are losers should take a look in the mirror and see what mold they fit into. Anti-preps just break the mold.
The anit-preps got picked on by the dumb jocks, who were neither skillful nor intelligent, but in the end the dumb jocks were too dumb to get anywhere and now pump gas at the local Mobil Station.