It's a special move that activates, when you are masturbating and the same moment, the jizz shoots out, you fart, so it bacomes a magical moment, in that everything is released from your body and you go into transcendence
Bob: Y'know Billy, yesterday was great!
Billy: Why?
Bob: I had a wank and stank, it shot me into stratosphere.
Billy: Wow, I've heared about it, but I thought that were only legends!
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?"