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F.B.I.A. 

your mommas a F.B.I.A
F.B.I.A. by Anonymous October 4, 2003
F.B.I. stands for "Fat bitches incorporated" and is generally said to people who date fat women or like fat chicks.
"Ayo Jamal you are F.B.I. dawg!"
F.B.I. by Virgin2018 May 17, 2018
means "friends in bed"; another term for 'friend with benefits' or a nicer way of saying 'fuck buddy'.

friends who have a causal sexual relationship.
Soup is a most agreeable f.i.b.; he comes over, we fuck until we're both satisfied and then leaves.
f.i.b. by Sheila July 27, 2006
Friendly Illinois Buddies. For crying out loud those FIBS aren't that bad. At least they know how to drive unlike the wisconsinites who drive like their freaking grandmas, stopping every minute to say hi to someone you know. We get it your friendly. Do you ever wonder why we drive so aggressively. Maybe it's because we have somewhere to be and because WE CAN. Get over it people from wisconsin, Illinois is the better state, better drivers, better pizza, but not better football GO PACK. Maybe you should drive faster eh?!
person 1: did you see that F.I.B over der
person2: Finally someone who knows how to drive
person 1: You're tellin me
F.I.B by The only red school bus September 29, 2020
Federally immune Bandits
Derogatory/Offensive

Slang for ATF referring The controversial and unconstitutional practice of gun regulation and/or confiscation branding them bandits or thieves for infringing on American rights and confiscating guns And can’t be prosecuted nor punished for when they stepping out of line
Those F.I.B ain’t raiding my house without a fight
F.I.B by OldDogg April 28, 2021
Fr. O'Mally, the new parish priest is FBI..
F.B.I by ssss October 27, 2003