Top Definition
Short term to designate a guy that is bisexual.
Guy1: Wow, Steve had intercourse with a girl and another guy at the same time!
Guy2: It's because he's a biguy.
Guy1: Oh, I see... But how does one become a biguy?
Guy2: Follow me to my room, I'll show you.
by evildwarf April 07, 2006

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