Similar to a catch 22 but with peeing.
Sometimes when one wakes up in the morning needing to pee really bad, it might be accompanied by morning wood.
If thats the case then the guy is facing a Pee 22 because the strong need to pee is maintaining a hard on and the hard on is preventing him from peeing.
The only way to pee is by eliminating the hard on first.
"The other day I had a pee-22 situation. I sat there for 10 minutes thinking of my grandmother jumping on a trampoline so that I can piss"