Someone who posts obnoxious Tweets about how much they love Justin Beiber. They talk about him 24/7 and he doesn't even notice them. Oh yeah, and he's not really a guy, so that's why you're a fag if you post abut Justin Beiber.
Twilight Chick: " Did you hear Justin Beiber's new song 'Baby' OMG! It's to die for! I talk to him every day."
Cool Dude: "Oh you're just Beiber Fag. I don't need you."