Typically and almost always "fuckshawty" means a girl that gets fucked a lot. Not necessarily by many guys but she gets fucked a lot. It's almost common sense. Fuck = sex. Shawty = girl. Fuckshawty = sex girl.
Also in jail / prison they rape men and women and call them fuckshawtys / fuckdaddies
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.