piss jitters 

The feeling you get when you urinate.

"Do you ever shiver when you pee? Yeah, I get the piss jitters every time!!"

piss jitters by JohnyNFullEffect March 13, 2009

Piss jitters 

When you have been needing to pee but you neglect going, resulting in you shaking uncontrollably in short bursts.

I needed to urinate so badly that i got the piss jitters, i looked like Michael J Fox.

Piss jitters by JimGherkins May 2, 2017