The condition of havinig abnormal amounts of arm hair, particularly on the forarms and sometimes spreading all the way up to the shoulder, similar to those of actor Robin Williams. The victim is so hairy, that they are often confused with a silver-back gorilla even while fully clothed.
damnit tim, please take care of your embarrasing robin williams syndrome before i get made fun of for associating myself with a silver-back gorilla.
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?"