to make money illegally, such as not reporting it in your income taxes. i.e., drug money, gambling, etc.
"gettin mad money off da books this year"
by thomas February 10, 2004
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A vehicle that is completely "decked out" as far as engine, audio system and anything else found inside a vehicle.
The judge at the car show said "that ride is off da books!"
by Element Master October 17, 2009
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