Literally means nothing, but generally used as a greeting or goodbye. The phrase may also be used to describe a moment of guys being dudes.
*Kyle walks down hallway*
*Sees friend walking to his direction*
"Hey dude, Posted Up in York!"
"Haha, Posted Up in York!"
*Kyle and friend continue walking to their destination*
When you roast someone and they have no comebacks at all and just standing there, absorbing the screams from the crowd as the roastee, makes a square in the air with his hands, and waves a check in the air.
1: You're ugly!
2: That sounds like a mouthful, i'm sure you used that when you were choking on your dads dick.
Crowd: OOOOOOOOOOOOOOOOOOOOOOOOOOOOOHHHHHHHHHHHHH
an example of someone being Roasted, Toasted, Packaged up, and Posted.
Me: please help me i'm bored and made a shitty meme...