This was made up when Mirikh was too tired to actually say the full sentence "You Fucking What Mate?" after getting offended by something someone said on Discord.
Guy 1: This guy :slight_smile: :point_up: fucked this guy :slight_smile: :point_down: in the ass
Mirikh: YFWM?
Guy 1: What?
Mirikh: YFWM > You Fucking What Mate, just made it up. You like it? You can use it if you like.
Guy 1: Wow, why so toxic.
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?"