the act of a friend ending a woman's attempts to make a sexual conquest
female: I was just about to get some--why did you block the box?
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to put a halt to a woman's attempts to hook up
similar words: gridlocked, block the box, blocking the box,cock block
"Shit, i've got to gridlock my friend. She must be wearing beer goggles because she's hitting on the ugliest person in the bar."
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