Your typical rich white kid who thinks he/she is better than everyone because they are "normal" typically the males boss others around and do everything the school has to offer, while the girl judge people if they are poor, different, or just not preppy. Also prepfags are found predominantly in rich areas, and basically all of alaska, they are true cancer to society.
Guy1: why is ryan alwaysbossing us around?
Guy2: don't worry, he's just a prepfag.
Noun: a thinly-disguised effort by studios to prepare moviegoers for some type of negative event. Usually found in Apocalyptic movies, plot and narrative take a backseat to whatever agenda is being pushed or scare tactic is being used.
"'Contagion' was some of the worst prepaganda I've ever seen, even more so than 'The Day After Tomorrow!' I think I'll go buy some Purell and a gas-mask though...."