A group of Fags. Usually partying or clubbing together or doing something that is quite faggy. And usually denotes a motley crew of Fags, not just cloned Fags, hence referring back to the tv show F Troop where there were characters / soldiers of different looks, heights, ages, etc.
Check out that F Troop over there! Did you ever see such an epic collection of Fags in one place?
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.