An annoying person who pretends to be someone they are not.Some try to act lke they are goth or prep or scene etc.Some are friends that try to act like you usually because they think you are cool.These types of posers usually have low self esteem or daddy issues.The second kind of posers are the most annoying as they will try to do everything you do or buy whatever you buy.
Poser:Look at my new DC shoes and Hollister hoody!They are just like Sally's!
Person:Shut the fuck up poser.