to sit around and do nothing for a long period of time
Ian: Dude im so bored
Sam: Me too
Ian: Wanna post up?
by stagssssss May 15, 2011
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a term used as a synonym for "sleepover".
A: yo Cronin, can we Post Up tonight?

B: aight that's cool, you can Post Up
by sauce kid February 22, 2009
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To sit somewhere or lay down watching t.v with a laptop (optional) and doing nothing for extended periods of time, without a care in the world.
"Yo man. I just got outta class. I'm bout to post up for the rest of the night."
by The Johnster1324233 February 16, 2009
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to take your place on the street to do some hustling
Yo, is that Black post up down the block?



by honky April 29, 2003
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to raise up, box up, get ready to fight
U wanna throw down? post up then nigga..
by Rick D May 15, 2004
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To stand in a highly trafficed, by people, area and conversate with fellows.
by Austin Burger December 10, 2007
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(noun) When building roof trusses, when doing a hip system it is a truss that has extra support at the top which includes a horizontal beam and 2 or more supports.
Hey.. Dont forget to put in the post up with that next truss!
by Nbail March 8, 2006
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