poser

Heard this word bantered about a lot over on the VH1 Music Boards I used to frequent. The first time I encountered it was there a couple of years back, and it was usually used by folks who were dissing some band they didn't like for being a sellout, or a fraud to whatever genre they worked in (rock, grunge, etc.) The youngest on the board, especially the high school set, used poser the most. Am I getting the true sense of the word, poser, here, or am I missin' something?