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1. A car full of unattractive and most likely overweight women (Sometimes referred to as Grenades).

Origin: This one time we saw a car that is shaped like a box driving stuffed full of ugly bitches. We called it a "Box of Grenades" then shortened to "Ammo Box"
On our way home from KFC we saw a huge Ammo Box pulling into the drive through!!!
by Falco399 July 13, 2011
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