poser

A poser is someone who acts like someone he/she is not to act cool. A poser will pretend to know all the latest trends that apply to the group he/she is trying to fit in with, but the poser will actually have no clue whatsoever.

This term mostly applies to stupid girls who try to act like Queen Bees they see on TV, by acting even MORE retarded (and telling people about it), speaking in a nasaly tone, acting like a drama queen (and being proud of it), pretending to have Paris Hilton-related problems, dropping names of designer brands she obviously doesn't wear, and/or claiming that she is a trash talker even though a 3 year old's putdowns could make her burst into fake tears.

ASpeaking with an enemy:
Anna: "OMG I'm soooo anorexic, even my Ralph Lauren cardigan won't make me feel better."
Alexa: "Ugh whatever, you poser!"
Anna: "O really, are you trying to be mean, like me????"
Alexa: "You're not mean, you're just a drama queen"
Anna: "OOOOOhhh, I know!"

Talking to a friend:
Sandrina: "It must be hard for actresses to act dumb."
Anna: "THAT'S SOOOOO NOT TRUE! I act dumb every day!"

the sad part about BOTH these examples is that they've actually happened. no lie.