An unspoken contract to give/receive Red Bull's between two coworkers. Whenever one of them buys a Red Bull on their way to work, they will buy one for their coworker too.
There is no requirement for an equal amount of giving and receiving. The contract remains fair as long as it remains unspoken.
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?"