When your spouse or significant other is in bed with the flu, you sneak into bed and start pounding her from behind. Then offer her a tablespoon of semen instead of nyquil.
My wife stayed home sick today, I think at lunch Ill go home and give her the infected sleeper creeper.
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.