An escott is the act of putting your right hand in the shape of a handgun (using your upright thumb and extended pointer finger, while the other fingers are made into a fist) and placing your chin between the crook of your thumb. Most often used in pictures, where the person looks off into the distance and is deemed "thoughtful".
Also: the new duckface
"Hey man, look at that chick's profile picture! She's totally doing the escott!"