An anacronym for the term "free balling it",it is shorthand for a male's decision to go sans swaddling or minus his u-trou...
When he realized he was out of clean underwear,Carl decided to go f.b.i.
by sheila in the car January 13, 2010
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Female Body Inspector
Bob looks at girls a lot, hes is a female body inspector
by Geppy February 24, 2005
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Fucking Big Indian: A large man or woman of indiginous roots. Commonly sighted at bingo halls and beer holes, this species can be quite dangerous when approached.

To avoid harm, look directly at the F.B.I., and slowly back away. It has been noted that throwing coins will distract them.
You walk into a bar or a bingo, and what's the first thing you see? That's right, it's an F.B.I. staring you down like you were a word they couldn't understand.
by mik-mak-patty-smack October 7, 2006
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Another government employee? Yup--it's the F.B.I. again......
by Bal-der-Dash January 23, 2020
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F.B.I. stands for floppy ball index. The index ranges from 1-5, 1 being really tight, and 5 being the floppiest it can be.
guy one: Hey dude, whats your F.B.I.?

guy two: (grabs balls and feels around) I'm at about...a 3.
by L. marx January 25, 2006
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A person From the Big Island of Hawai'i visiting another island, especially O'ahu.
person 1: Where are you from?

person 2: F.B.I.!
by Mariann November 19, 2007
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