What is Poster?
1.
Parent over shoulder abbreviation. Used as a disguise for POS.
John: POSTER?
Jim: nope
Jake: POSTER
Jack: ok
2.
Bulletin board author
A user who authors a "post" in an online bulletin board.
3.
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
See
4.
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."
See
5.
another form of the word cool; to approve of
I just saw that movie and it was totally poster
See
6.
I.e. cool, mega cool, excellent
"I would love to goto see ACDC live man".
"Me too, that would be poster!"
See