1 definition by kaylaxmarie18

Top Definition
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..."
by kaylaxmarie18 April 12, 2010

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