A female that you can fuck, jizz on or in (See also: Cum Dumpster), and toss her to the side because she meant nothing more than for you to bust your load.
"When I was done, I treated her like the disposable cumrag she is and told her to get the fuck out.
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.