Originated in the locker room after zero hour by Audrey, it is used in conjunction with "day" as in "FYIDC day" It means to not care what you're wearing, Audrey uses it for days where she threw things in her band bag and wears her Birkenstocks.
Man, I got my Birkenstocks. That can only mean one thing. IT'S FYIDC DAY!
a phrase often used when referring to the dapper young individual known as Darren Criss. also a popular tumblr account devoted to the latest news on said individual.
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.