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.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.