short for 'be back when i feel like it' - an abbreviation first coigned by John Duckworth and currently used when a person is going away from their computer for an unspecified amount of time and does not want to falsely imply he will come back soon.
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.