A person who is a complete weirdo or acts really strange. They can be young or old, but just out of the ordinary. Wearing weird clothes, saying strange things or being an outcast.
A guy wearing animeclothing and talking to himself is a sharkass.
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?"