when someone on a dating app uses pictures only with their hotter friends to hide their identity as the uglier friend in the group. they have no individual pictures on their profile.
"Bro this guy only has photos of him with his more attractive friends on his profile. I can just tell he's the short king with a bad haircut."
"It's because he's friend-masking!"
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?"