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
by Russell Baker May 27, 2008
Parent over shoulder abbreviation. Used as a disguise for POS.
John: POSTER?
Jim: nope

Jake: POSTER
Jack: ok
by Fredy May 28, 2005
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."
by olgga January 23, 2008
a Basketball term meaning to embarrass some one usually while slamming the ball over them. It refers to the guy whos being dunked on in basketball posters.
"Wow that guy just got posterized!"
by j-la August 23, 2003
All future generations ahead. All the unborn generations collectively. All the people who will exist in the future. All succeeding generations. -Emeasoba George
Posterity is synonymous with offspring.
by Emeasoba George May 3, 2018
A slang term depicting a play in basketball. In said play, a player dunks the ball over top or in front of another player, making a play so picturesque that it may appear on a poster, hence the term, posterized.

Some players may have their own versions of this, such as Greg Ostertag of the Sacramento Kings. When someone is 'posterized' by Ostertag, they are 'Osterized'. This pay is known as 'dirty' and 'ugly' and is generally unwanted throughout the NBA.
a) Yo man! VC just posterized the Pistons! Ben Wallace, you's a poster!

b) (taken from live stat tracking)

3:44 4th - G. Ostertag dunks the ball.
3:44 4th - Officials timeout for audience to throw up in bathroom.
by Uncle Ben November 29, 2004