1. The condition of gradually losing sanity due to the inability to remove "playbacks" of songs from your conscious mind. This occurs when hearing a song several times in a row, wherein your brain can create a cyclical version of the song that repeats key parts of the song without ever ending. In extreme cases, even one word or phrase can be looped infinitely depending on the cadence, tempo, and succession of notes, such as the viral song "Friday" by Rebecca Black for which this syndrome is named. Short term symptoms are agitation and short temper. Particularly long cases, one hour or more, can lead to acts which are unusual for one not affected by this syndrome, such as hitting oneself or screaming, and in extreme cases, attempting to tear oneself's clothes off, coating oneself in maple syrup and various car parts, and blocking rush hour traffic by screaming little known facts about President Buchanan at drivers has been seen in desperate attempts to overcome the syndrome. There is no known cure.
2. The condition of the syndrome in a group of an unspecified number.
3. Any other condition in which one is unable to rid oneself of audial memory.
Parker: Hey, do you remember that song where—
Gene: OH, WHAT THE HELL?! THAT THING GAVE ME FRIDAY SYNDROME FOR LIKE A MONTH AND NOW YOU REMIND ME AGAIN?
Parker: I didn't know the Atlanta Symphony's performance of Vivaldi's Four Seasons had affected you that way.
Gene: You did that on purpose, asshole.
When you have the urge to burst out in song singing "Friday", say phrases like we so excited in your vocabulary, say the word fun multiple times, act like captain obvious when its friday and you say yesterday was thursday, and your biggest life threatning problem is which seat you should take in your 13 year old friends convertable.
Sarah: We so excited because yesterday was thursday, and today is friday, and were gonna have fun fun fun fun because we going for a ride in my homeboys convertable even if I don't know which seat to take.
Ami: Fun Fun Fun Fun
Kylie: We so excited.
Tia: SHUT UP! You guys have an extreme case of friday syndrome.