To urinate, piss, make water so on and so fourth. Would be said by a person who considers himself a pony stallion. Not because of size, but of lifestyle /fandom. Brony term.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.