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1.
A phrase usually stated during a basketball game in which one player embarasses another player by either vigorously blocking his/her shot or emphatically dunking over someone
(after somebody dunks over Kwame Brown)
Marv Albert: And (insert player name) puts Kwame Brown on the poster.

or simply

(in a mournful voice)
(player name)...........welcome to the poster
автор: Russell Baker 26 мая 2008
 
2.
Bulletin board author
A user who authors a "post" in an online bulletin board.
автор: Jonathan Corley 4 декабря 2004
 
3.
Really hott chicks that just sit at parties, and do nothing but look hot, talk shit, text, dance for five seconds, and do absolutely nothing with guys. Compared to a poster, because just like a poster, you can only look at their inutile beauty.
Damn, look at dat poster over there doin' nuttin but postin'.

Look at dat poster sitting on another poster like a post-it note.

Man, you see that fine ass bitch over there sitting with her friends doing nothing but texting, ignoring guys, and gossiping. Yeah, don't talk to her she's a poster.
автор: Sonnybun 25 апреля 2010
 
4.
Parent over shoulder abbreviation. Used as a disguise for POS.
John: POSTER?
Jim: nope

Jake: POSTER
Jack: ok
автор: Fredy 28 мая 2005
 
5.
(n.) A hipster-poser. Someone who claims to be a hipster, but doesn't fully commit to the conventions associated with it. i.e. liking music before it was popular, rejecting social norms, drinking coffee from Starbucks, etc.
"Look at that poster, shopping at Old Navy. He used to be cool, man." *drags on cigarette*
автор: PrimitiveMan 21 июня 2011
 
6.
an ugly little boy that looks like a girl. usually has an ogre looking girlfriend, and loves to call people rude and aweful names. all together he is a bad person..
"OMG, dude you're being such a poster right now."
автор: olgga 23 января 2008
 
7.
another form of the word cool; to approve of
I just saw that movie and it was totally poster
автор: jboev 12 апреля 2007