1 definition by The Anti-Beibernaut

Top Definition
1.) a man or woman obsessed with The Beibs.

2.) A young woman usually between ages 18-25 who has an irrational love for under-aged male pop singers, i.e Justin Beiber.
That girl in our math class is such a Beibernaut.
by The Anti-Beibernaut February 19, 2011
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