A term used by those completely inexperienced in the act of hooking up.
"Dude, I'm totally going to do stuff and more with that drunk chick in the corner. She's probably too trashed to notice that I've never kissed a girl."
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.