When you are giving it to a chick from behind, you yell out "Who's the boss?" She'll get confused, turn her head around, at this moment, you throat punch her and donkey punch her in the face and then scream THE 3 FOOT NIPPER!!!
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?"