1. Somebody or something that poses as, imitates someone or something.
2. A widly used (mispelling of an?) insult by immature people, usually to critisize people they don't know, hypocritcally, for acting and/or dressing a certain way "to be cool."
1. If a person were to pose for a/an artist/artists, a photographer, et cetera, they would be considered a poser.