When a girl who seems shy at first and is almost every time changing the 'sex' subject when somebody mentions it. In reality she wants to bang almost every guy at any time. This is mostly refered to high school and college girls who seem shy at high school but break free and become an 'Instant pussy' at college.
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?"