Someone who posts pictures of themselves holding a fish.
Selfie-fish = sailfish
They may also post pictures of fish they caught displayed on their tailgate.
Person 1: Did you see the pic Ted posted on Facebook!
Person 2: You talkin' about the fish pic?
Person 1: Yeah, what a sailfish! LOL
Person 2: You are a dipshit!
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?"