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Similar to blood brothers, when you have sex with a girl, you become box brothers with every guy she's slept with before.
Doug: Man, I'm sorry, I banged Sheryl last night.
Mark: Sweet dude, we're box bros now!

or

Sheldon: What a night, I ended up going home with Kristie.
Steve: Shitty, you just became box brothers with like 20 dudes.
by Crabzilla November 25, 2009
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Aug 11 Word of the Day
You can tell by the way she walks, she got that WAP.

You can look at her face and tell she ain't got that WAP.
by Black Don August 06, 2020
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