The titillating sensations one feels whilst urinating. Usually accompanied by a yell or moan, of some sort.
by Thekockyroach December 20, 2008
A piss-gasm is the orgasm a guy has when he's taking a piss and has a cumgasm because his bladder is pressing on his prostate gland.
I was taking a piss and had a piss-gasm!
by USAF Cadet November 21, 2020