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Literally "good vagina". A term used to describe a girl who is good in bed, or more loosely, a girl one wishes to fuck. Commonly used by teenage boys to describe girls that they wish they had had sex with, but who are in reality way out of their league.
Tom: How hot is Jane?
Sam: Yeah she's mad box.
Tom: Have you been there?
Sam: Nah, I wish.
by Lalalalalalalalalalalalala. January 28, 2011
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A piece of shit team that uses a piece of shit animation software. They try to be funny all the time but fail terribly.
John: Oh jeez...
Karen: What?
John: I feel like Madbox...
Karen: Oh shit, that must be bad...
by redboyguy5932 August 03, 2018
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