In a small hallway, when you walk one way, and someone else is walking in other direction, and you both get an awkward feeling where neither of you knows which way to go, and you both make small attempts to go one way or the other before you meet, only to have the other person unintentionally make the same mistake at the same time.
I almost bumped into So-and-So in the hall. It was a clostropathos inducing experience.
Clos-tro: Fear of being trapped in small spaces. The slang for "clostrophobia".
Billy couldn't find the exit sign in the movie theatre. So he freaked the hell out and his date called him out in front of the theatre by giving Billy a new nickname, "clostro".
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.