The one who can open their mouth the widest to take in the largest male scrotum (or teabag). It can also apply to who can suck on a teabag the longest, depending on the context.
Lance and Gary had a contest to see who was the real bagmaster at the party.
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.