To incite a fight, or to call someone out.
used when people are mad and desire confrontation.
Girl:(Greg) Dude you look like Justin Beiber!
Greg:awh, thanks,(:
Jim: Greg, what a fag,
Greg:Post Up then bitch!
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Usually used to describe a group of people or just one person who is always at a certain place, just standing around looking for something to do.
"Mad kids are always posted up at this Wawa."
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To be prepared or in the postion to sell drugs.
My brother Rell is posted up down the street
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While in the gym about to squat, bench, or deadlift you get your gear set next to the rack making sure that no one else takes it and that the person doing bicep curls realizes its time to get out.
I walked into the gym to post up at the squat rack; the d-bag doing curls realized it was time to jet.
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When you casually fuck your girl in a high school bathroom
Did you hear about that guy posting up his girlfriend in D wing?
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To post up is to lean against a wall, table, refrigerator, countertop, and in some extreme cases holding on to the ceiling, or any other convenient surface so that you do not fall down after consuming massive amounts of alcohol. Not only does this allow for a misconception of exactly how drunk you are, but it also makes a viable applicant for the next game of beer pong.
Dude 1: "There ya go Verser, post up. Don't let em' know how drunk you are."
Dude 2: "Is Verser posted up on the ceiling? Jesus H. Christ he has got swag!"
Dude 3: "I got Verser next beer pong game!"
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