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Stacking boxes is the female alternative to crossing swords; when two girls who are friends have smashed the same dude.

This is generally looked down upon for preserving a friendship. Girlfriends should never stack boxes.
"You should smash that fine dude!" - L

"No way! You did, I don't want to be stacking boxes with you" -A
by The Wetdiaper Bandit December 09, 2008
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