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The Anus, or more specifically, a female anus.
I'm going to plow that girl's dirtbox like there is no tomorrow!
Dirtbox by Xoc January 15, 2003

dirtbox derby 

To do it up the arse with enthusiasm...as if heading for the finishing post on a racehorse.
"She won't be sitting down for a week...I rode her in the dirtbox derby last night"
dirtbox derby by drbollocks September 28, 2008
Shit, I'd do her in the dirtbox... a lot.
dirtbox by Afext December 9, 2002

Dirtbomb 

1. A person who is extremely dirty, raggedy and usually smelly. They are mostly avoided by society because they are too disgusting. Also, because they are outcasts they form factions and roam the streets.
"Hey, I think i smell something..."
"Oh shit, it's the dirtbombs! Run!"
Dirtbomb by SkullKingGuy June 8, 2009

Dirtbox Racer 

The name given to some one who has performed a Dirtbox Invasion which is the act of doing a girl in her Dirtbox aka Anal Sex.
My boyfriend was a real dirtbox racer last night!
Dirtbox Racer by motordemon July 27, 2010
yea dude she was on the rag, so i flipped her over and stuck her in her dirtbox.
dirtbox by nathan November 14, 2003