adj. A person who is exceptionally fanatical about their religious beliefs, sports team, or other thing which they support strongly - to the point of being scary. Origin - cross between fanatical and satanical.
Sue was dancing around scarily when her favorite sports team won and she looked quite fatanical.
A Team Fortress 2 YouTuber who makes funny and entertaining videos with 129k subscribers at the time of posting this. He is also insanely good at the sniper class and gets kicked from a lot of lobbies by people who think he is cheating. However, isn't the most well-known YouTuber so you should go subscribe to him right now.
Guy1: "Hey have you seen Fatmagic's new video where he gets kicked from 10 differentlobbies?
Guy2: "Who's Fatmagic?"