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?
When someone at Jack in The Box gives you head.
David- hey Jeff did you hear Charlie got a Cock in The Box from Mellisa after her shift.
Jeff- Oh snap!
To slam your piping laying stiff penis into the victims mouth.
Huggy slammed his hard erect penis into Jose’s cock box so hard that he was picking hair out his teeth for a week.
(n) A total jackass, especially one who is particularly rude as well as overtly unintelligent.
Keith: "Dude, why are you being such a cock-box?"
Jon: "Gabbi's holding out lately, man, it's getting to my head!"
Brittany: "OMG Chad is so hot!"
Brenda: "Maybe, but he's a total cock-box."