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1. When a person appears to have two separate IQs, one at each extreme of the spectrum.

2. When someone can sometimes be a total dumbass, and other times be a complete genius.
Guy 1: You know that guy, Nick?
Guy 2: Yeah, he can sometimes be a total nerd and other times be a complete dumbass.
Guy 1: Yeah, he's got quite a biq.
by Eli E. January 16, 2010
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2
BIQ is short for "Beat It Queer". It is used to dismiss any loser from your presence.
by Red Bull Rehab August 29, 2016
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