(n) Someone who poses for a photograph or a work of art.
Look it up.
Although, a 'poseur', if that is what you meant, is
po·seur pō zúr
(n) A Pretentious Person: somebody who tries to impress others by behaving in an affected way
I'm unsure why people changed the spelling of it, but it is frowned apon. You have just made an ass out of you and me.
2) same as poseur (informal)
Todd:have you heard american idiot?Thats the bestest song ever!
Bill:Have u even heard any other green day songs?
Todd:what other green day songs?