To stand up and get into line, like posts in a fence.
When the prison guard tells everyone to "post up" he means for the prisoners get into line to be counted.
by susiepostedup December 26, 2011
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1. when you have just dumped or been dumped, and you are feeling majorly low, and all you wanna do is sit around and cry and eat chocolates and strangle the teddy bear he gave you...

2. if you've just been parted from something you majorly love, and you're really down about it.
"dude...i'm suffering from PBUS"

"damn it! i can't believe i'm not the play is over, i'm having theatre PBUS!"
by converse_kid February 19, 2004
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Just chilling or hanging out somewhere, often with others, while leaning on a wall or post and lifting one leg, placing that foot against the surface you are leaning on. Folding the arms is also common, but not necessary.
"Before the bell rang we didn't have anything to do so we all decided to post up on the wall. It was B.A."
by TJCapSix March 8, 2006
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to show up at a location, chill or hang at a location. go some where or meet with friends or homies
hey, i gotta go post up in class or they gon' kick my ass out.
by 'Preme' December 28, 2007
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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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