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?"