noun - one who acts like something he/she is not. usually deals with music. people who think they are punk but are just dumb. avril lavigne.
Billy- Wow Johnny, you sure are punk'd out today with your liberty spikes and leather jacket!
Johnny- Yea I just found a new punk band that you'll never know about.
Billy- O? and what band might that be?
Johnny- New Found Glory
Billy- Stop being a Poser Johnny.