When one has sex with his girlfriend after they have been broken up, by pulling a full rotation (360) back to his ex-box.
"Man did you hear Bill and Jenn hooked up again?"
"Oh what? I thought they broke up a month ago."
"Yea, he pulled an ex-box 360."
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When all of an ex's belongings in a person's possesion are being kept. Usually implies that person is not quite over the ex.
She's having a hard time with the break-up; it's been months and she still has the ex-in-the-box.
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taking a poop inside a box then wrapping it up and giving it to your girlfriend as a means to break up
Example "I gave her an ex-box, i hope she wont be too upset"