Top Definition
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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