noun- a sickness, that has recently been becoming more common, where a girl, or boy, is extreamely obsessed with Justin Bieber
, and everything related to him. There is no cure found for this yet.
girl- "I don't know what's wrong with me. Lately, all I can think about is Justin Bieber. And every time i hear his name I want to do him even more..."
doctor- "you clearly have a serviere case of Bieber Fever..."