When a customer is looking for a certain store item and they ask an employee to check in the back inventory for it.
Guy : Yo you got a t-bone steak?
Employee: Sir, this is a baby food store.
Guy: Uhhhhh check in the back, the FAR back for dat shit.
Employee: Damn wow we actually have one left
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?"