"Grungus" is a word used to describe filth. It is both an adjective and a noun. Things that are dirty/filthy are "grungus" or "covered in grungus." The word is more than this: it is the embodiment of disgust and repulsion, and is typically used hyperbolically.
"Sis wtf did you cook in here, the kitchen is covered in grungus."
or
(reacting to something gross) "That shit's grungus, bro."
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.