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One who tries, usually failing miserably, to fit into a group. (Usually trying to be a punk)
One Poser: Oh my god! Ashlee Simpson lip-synchs!

Other Poser: I know! She doesn't rawk. She isn't punk like us!

One Poser: Tell me about it! Let's go listen to Avril Lavigne cd's!

Other Poser: okay!
poser by The Glue July 15, 2008
Avril is the best in the world. she can play guitar and she can sing
poser by alexander _alex July 15, 2008
Someone who attempts to join a social group or clique for reasons of popularity or recognition rather than because they believe in what the group represents.
Why is he even here? He can't even ollie! He's such a poser.

Ashley Simpson
poser by GreenPork February 16, 2007
Get rejected at every attemp of conversation or attemp at fitting in with others and gets really depressed goes in the bathroom to "cut" their wrists.
boy1: Hey guys, did you hear the new fall out boy song "sugar we're going down" on muchmusic lastnight?

boy2: stfu poser, you suck hardxcore cock.

girl1: i totally agree, go kill yourself or something you stupid emo-wannabe.

*boy1 leaves to cut in the washroom*
boy1:i hate my life no one likes me
poser by electrikkkk December 28, 2005
A derogatory word for someone a certain person does not particularly like. Used to show how much person a knows about the "scene" by insulting person "b".
Person B: Hey! Do you like Taking Back Sunday?
Person A: Oh my god. You are so lame. Taking Back Sunday isn't cool.
Person B: ...
Person A: And are those Converse? Don't you know everyone wears Vans? You're such a poser.
Person B: *slits wrists in the bathroom*
poser by powertrash July 28, 2008