PCP (Post Cum Piss) Share definition Flag The PCP is the piss that a guy usually needs after they have cum. After screwing Jill, Malcolm urgently needed to have his PCP (Post Cum Piss)or his bladder would explode. PCP (Post Cum Piss) by Clandky May 4, 2009 0 0 Get merch Get the PCP (Post Cum Piss) mug. Buy Now — $32.95 See more merch