piss balloon 

What uncut men can do if they wake up with a piss boner and pinch the end of their foreskin closed when pissing. The foreskin expands and becomes a piss balloon.

Best done in the shower, or over someone you either really hate or who finds watersports fun, as releasing the skin causes a real explosion of piss.

I had the usual morning piss boner, so I made a piss balloon on the way to the shower.

piss balloon by rugbyman September 21, 2005

Piss Balloon 

A balloon which someone (most likely to be male, and by chance happens to have a pack of party balloons at the time) may piss into at a festival or camping trip, like a waterbomb, if too drunk/tired/cold to leave the tent.
Just be careful not to pop it!

Guy A 'Uh-oh...'
Guy B 'what's up?'
Guy A 'My piss balloon has just exploded'

Piss Balloon by paggywaggygumdrops May 5, 2019