a lewdly obscure reference to a woman being good looking. Mint = perfect, box = pussy. "that's some good lookin' pussy!" It's literal meaning is supposed to be akin to "she's hot", or "that's one great looking woman"
"Ya bro, she's mint box", "that's some mint box right there"
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Someone so un-attractive that no matter what they do, there will always be ugly
Girl: Did you see that new shirt Pete bought?
Friend: It's not gonna help, Pete's mint in the box ugly
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