(v.) Shooting a gun loaded with 'blank' rounds that create smoke and noise, but bear no fruit from the barrel.
(v.) Ejaculating/shooting a penis which is impotent (the seminal fluid cannot contain sperm, hence it is 'blank'). After the owner of the penis going through the motions and making noise no fruit is born of the barrel.
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?"