Code used to tell a friend that you are going to take a piss (971) or a shit (972). Sections also exist to define the length of time of the said procedure.
Friend 1: yo man why you got that look on your face...
You: Man i gotta take a Code-972 major
Girlfriend: You boys and your lingo.
Friend 1: haha she doesnt know what the hell we are talking about.
You: Yea man actually its gonna have to be a section 25
Friend 1: DAMN!...BOI
Code-971 / Code-972, the choice is up to you
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"