loud, abnoxious, annoying, fake, think's they're hot stuff, uncool, a joke to society, uncared about, foolish, immature, melodramatic, believes that their crazy beliefs are truth.
In a sentance: "Did you see that pippy girl on stage introducing that last band? She was talking about inside jokes she has with them. Lame, yeah?"
Other usage: "Welcome to Regis Philbin's New Year's Pippin' Eve!"