Someone who gives zero fucks about anything. They do whatever they want, whenever they want, wherever they want!
Conner: "Yo Ethan! Did you do the assignment for Grad School?"
Ethan: "Nah Bro, I am a Super Gremlin, I skipped class and smoked a backwood the size of King Kong's finger with the Professors wife."
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.