The act of standing under the object of your affection's window and tossing pebbles at said window, to get their attention. They should go to and open the window, see that you are there, and then go to the front door to meet you.
Must be done at night to achieve proper effect.
He went out at 1 am to go pebbletossing at her house.
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?"