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When having sexual intercourse with a woman and you come upon climax; instead of pulling out and shooting your wad in her face or guts, you shoot your load on the inside ie. "dumping in the box."
Cody: dude, i boned that blonde chick that works at the customer service desk.

Geoff: Did you pull out?

Cody: hell no bro i dumped in her box!!

Geoff: Fuckin sweet dude i'll take your sloppy seconds.
by Ovarian Headbutter December 22, 2008
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