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Bieber Fever is when a bunch of gullible preteens get infected by Justin Bieber's annoying tunes and stupid merch. You know you've got it if you have a poster, know all the lyrics to 'Baby', and cried in the theater during his movie.
I had to buy three posters just to feel better.
I knew every word to 'Baby' before I even knew what love was.
I cried so hard during 'Never Say Never' I had to leave the theater.