Catchy Chorus Syndrome

(Abbreviated CCS) When a song is stuck in one's head, but only the chorus or a section or phrase in the chorus can be recollected.

Garret: bmbdmmb... ROCK THE CASBAH! ROCK THE CASBAH!

Arnold: Dude, what's wrong with you?!?!?!!

Garret: Ehh just Catchy Chorus Syndrome. ROCK THE CASBAH!!!!