The Post-Coital Piss. The piss taken immediately after intercourse (either with a lady or your own hand), preferably whilst still nursing a semi. The feeling of enjoyment is only marginally less than an orgasm. Second to the act of banging a fair lady, the PCP is one of the greatest things known to man.
Dave: I fucked
the missus senseless last night, pulled out and ran to the bathroom with my still erect cock
for a PCP. Bliss.