When a male wakes up in the middle of the night having to piss so bad that it looks like a boner. Sometimes it is rather difficult to actually piss with a piss on, but it is extremelyeffective for holding a nut.
Damn, I woke up last night with the biggest piss on. Then, I screwed my girl for an hour without busting my nut.
A “piss on” or “pison,” in American English, is a person who is a common laborer, worker, or otherwise low ranking employee/person whose multitude of expressions and workmanship are considered inferior by higher ranking/earning individuals. Generally the term is derived from warships where Navy workers removing barnacles from the aft/side of a ship would regularly be “urinated upon” by fellow Navy staff as they were performing their duties as most Navy staff were instructed to urinate into the ocean/sea whenever the need would arise.
“Jeff was serving in the Navy, and his friend Steve was a barnacle removing specialist - otherwise known as a ‘Piss On/Pison’ as our piss would regularly become their greatest threat to their dignity.”