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It is a type of Otaku. This word identifies an otaku girl who fantasizes a romantic or intimate relationship between two males.

An example of a manga that makes reference to this word can be found in "My Girlfriend's a Geek".
Boy: Hey, so what kind of otaku are you?

Girl: Hibitaku!
Boy: O_O
by WanderingThought November 30, 2011
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