Euphemism for "go to strip club and grab tits". Used primarily by people who are trying to be sneaky and not admit they're going to strip clubs.
Origin of euphemism was from an asian man who would periodically go with his friends to Montreal(the capital of strip clubs) and when asked why he was going, he'd reply, "play basketball".
me: "So what are you going to Montreal for?"
ak: "We're just going to play basketball."
me: "You're not going to the strip clubs, I hear they're really good."
ak: "Nope, we're going to play basketball."
me: "ok(thinking to myself, yeah right)"
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?"