A North Korean who has been extremely underfed, and often is prone to anger and violence. Most carry AK-47 assault rifles with them at all times. Even on the Potty.
"Oh shit, its one of those crazy malnutrition fuckers! Run!!!"
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?"