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1.
1:sexual actions that are hidden, by having one person slide their hand into the other's pocket and pleasuring them

2: sex between midgets, who, due to their smaller size, can sometimes have sexual intercourse inside the pocket of a coat.
*thump, thump thump thump.*

"psst, hey, could you keep the pocketsex down? ....fucking midgets...."
by davidmcmuffin August 17, 2011