poo sweats

When you need to poo so badly that you feel cold inside and sweaty outside.

I needed to take a dump so badly that i got the poo sweats

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.