When the mens room at your office building has not been cleaned for an amount of time that allows the rim of the urinal to collect pubic hair. The collection then appears like a mustache on the rim.
I almost puked when I had to use the restroom and the urinal mustache tickled my hand.
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.