to make your presence known. Could be done while getting a photo taken, waiting for a bus, or simply hanging out. Usually done by standing straight up and grilling.
What do you say we get some chairs, sit in the middle of the mall, and just post up?
by JT Dollar Sign December 20, 2003
Get the post up mug.
A basketball term in which an offensive player pushes his ass into a defender in hopes to push the defender backwards. The goal is to get closer to the hoop and get a basket.
He better post up against lebron if you want to make a basket
by Naturecamper July 11, 2016
Get the post up mug.
I'm so posted up for shark week.

Oh my God, this song gets me so posted up!

I love this place. I'm so posted up right now.
by postedupforhiphop August 10, 2009
Get the posted up mug.
What many people say to others after they post an entry in something, usually in an online blog.
"Post up" - Bob
"Alright, I'll check it out in a little bit." - whomever he is speaking with
by Vio-lence March 8, 2006
Get the post up mug.
When a broad is showing great interest in a guy, and really wants to fuck him.
Money: "Yo Wake, that broad wants your cock eh?"
Wake: "Yea she's Postin-Up hard!"
Money: "I'd let her Post-Up any day"
by Money Wake April 8, 2008
Get the Post-Up mug.
A)To take a shit.

B)When you have to poop and you post up on the shitter.
A)Man, I really have to post up, I need to find a bathroom soon.

B)Every morning my boyfriend posts up with his PSP for a good 30 minutes.
by Sarah Lambert March 3, 2008
Get the post up mug.