PSTB Share definition Flag When your cock decides to make love to your ballsack, so they stick the fuck together for some odd fucking reason. Worst of them all, you have to do squats just to unstick it. Damon: Dude, I got PSTB. Joey: Just do squats, it'll unstick. PSTB by AnonymousBronyDude October 11, 2013 Get the PSTB mug.