Male genitalia that is as long as it is wide and can be small or large.
Dude: Baby, I hope you're not a virgin 'cos this bad boy's gonna hurt.

Girl: Oh it's wide... do you have a box cock then?
by Ad_88 May 22, 2008
A Cock that is as wide as it is long...
Linz: Oh my, riding you is like riding a cube
John: umm thank you, its beacuse i have a box cock
by Linz_nffc January 30, 2008

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