The act of reaching over somebody and pulling their shirt (or jersey) over their heads, but not off, so their arms are not usable for fighting or defending themselves. They also can't see.
To use jargon specific to an area of expertise you and at least one of the people you're talking to understands that is unfamiliar to other people around you; thus excluding them from your conversation.
Civil engineering student 1: "Hey, check out that spiral reinforced column over there, I wonder what the dead load is on that member?"
Civil engineering student 2: "About as much as I load on your mom every night."
Dumbass arstie: "Despite the jargoning, I understand you just burned your friend pretty good, huh?"
Bob: Man, I can't believe you punched and killed my baby!
Joe: What man it wouldn't stop fucking crying, I needed to shut it up.
Bob: My wife's gonna kill me now, thanks for Jareding my life.
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.