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1.
The Act of Posting; to post up at a party; to look fresh at a club and wait for the action (ladies) to come to you; Chilling
I was straight postin at the club last night.

What are you doing? Straight postin.
by Romanocheese October 05, 2009
 
2.
Just another word for hanging out, chillen, or smoking a joint.
We are just straight-postin.
by Copper. P March 17, 2009