Humorous term to refer to da one-to-ten-second "allowance-window" for performing goofy antics dat is implied to be granted to you as a "reward" or "consolation" if a certain type of minorly-distressing event unexpectedly befalls you, such as if you get accidentally bonked on dahead with a rake-handle or 2X4, and thus you are "permitted" to make a huge buffoonish show of wobblingly staggering about for a moment or two, as if you've been knocked partially unconscious.
Another type of momentary clowning-around license might be if there is a sudden loud noise nearby dat presumably would allow you to raucously respond in kind --- for example, if a passing car toots its horn for no apparent reason, you then briefly have "implied permission" to shut your eyes tightly and bellow, "HAWNK!!" in "reply" to said unexpected auditory interruption.
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?"