The gap between a women's thighs directly below the vagina, often diamond shaped when the thighs are together. Also called a thigh gap.
Man that chick has a hot box gap
by kirjava September 12, 2012
Box gap is another term for the vagina. Its origins can be traced to Brisbane, Australia, where it was utilized to troll girls via text message.
That girl had a bloody box gap, but he still went there.
I really want to stick it in Kates box gap.
Wow, that box gap last night was tight y'all mean?
by morrisonzzz May 03, 2011

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