The next step above just being a regular bitch. The king/queen of bitches. The most derogatory term so offensive that it causes people that overhear it to "poot" (fart).
That's it. You've pushed me too far! You sir, are a Pootie Bitch! *poots*
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.