No paper trail , on the down low.

Don't tell no one. kind of like when someone is hiding money they keep it "OFF THE BOOKS"
ELLIE : HEY I NEED YOU TO DO ME A SOLID, BUT KEEP IT OFF THE BOOKS.

ANGEL : I GOT YOU , SAY NO MAS.
by Elliedizzle420 December 1, 2018
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doing sth without following the standards or procedures
don't do the experiment off the book!
by Bai LI September 3, 2007
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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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When you have memorized all of your lines.
Girl 1: Are you off book yet?
Girl 2: No.
by theatreslang July 16, 2020
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Going online to social networking sites eg. Facebook after a few too many drinks and doing things you may later regret or even forget.
"I was stupidly Off-your-Face-Booking last night and poked some people I shouldn't have!!"

by Mats101 November 20, 2008
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