The chance or possibility that one has to make a bowel movement or "poo."
"I'm going to the bathroom to take a piss, but there's a definite poossibility."

Trent: Where's Preston?
Steve: Oh, he decided not to stray far from his toilet due to a strong poossibility
Trent: Good call
by shwazbag November 25, 2010
Get the Poossibility mug.