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To tell the truth, the whole truth, and nothing but the truth. AKA "Keep it Real" or be honest with youself as well as others.
Used the same as "on the strength", "on my Momma", "swear to God", "real talk", "on everything I Love" "on the for-realla my nicca" and of course "Keep it 100".

by Simply Ecstasy December 09, 2007
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2
to keep yourself real and true, to be honest and stick to the way you are, no matter what any one else thinks.
I gotta stay focused and keep it 100 these last few weeks of highschool so i can get into college. And that's real talk!

You don't have to like my decision. I'm gonna keep it 100 and do what I feel is right.
by HightowerBrownSkinStar February 17, 2005
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3
Keep it pure--like keep it kosher.
"Ye told me to kill yall to keep it 100" Jay-Z - DOA
by ACabana July 21, 2010
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IN BRIEF: to keep yourself fake and false to yourself and/or others; to be dishonest; to resist the temptation to be real or stay real or keep it real, regardless.
WOMAN: You know I keep it 100.

MAN: You mean you keep it -100.
by Mr. Terrence L. Trezvant May 28, 2010
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a financial planning technique whereby one attempts to keep all c notes intact.
"I just made 100 bucks today!"
"Keep it 100."
"You know what, I think I will resist the temptation to smoke and drink my earnings away."
"That's smart, bro."
by B.S. Jones January 29, 2015
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The vengeful act of crapping on a lover's chest while they sleep.

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6
Adding 50 and 50. In otherwords, you are bi-sexual.
Rationality is keeping it 100 by fucking both boys and girls.
by Gato Negro March 06, 2005
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