Another word for nasty, but of a heightened nastiness. Old cheese is nasty. Old cheese with diarrhea on it is nersty. Often pronounced with a long "r" as in nerrrsty.
That movie was sick! But the part where his grandma vomited on the dog was nersty!
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.