Just chilling or hanging out somewhere, often with others, while leaning on a wall or post and lifting oneleg, 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."
A term originating in biblical times, refering to the day after humpday: Thursday. It is the point in the week were you have past the midpoint to the weekend and your body yearns for a cocktail or two. This ultimately leads to Thurday being the biggest party night of the week, full oF orgies and wine. In the town of Gibsons BC Canada, they have actually made a four day work weeks, because no one was showing up for work on Friday.
Justin: Hey, what are you doing this Little Saturday?
Andy: Going to the Roxy and getting fucked on Jager Bombs.