FBI
FBI is best known as the United States Federal Bureau of Investigation, though the letters are also employed humorously to describe frequent blunders or other informal phrases.
Medical
Miscellaneous
Front Board of Idiots
Facilitators of Banner Instruction
Federal Bureau of Imagination
Forever Bothering Italians
Fine Babe Inspector
Federal Bacon Investigation
Fumbling Botched Investigations
Full Blown Insanity
Foolish Bungling Idiot
Forever Buggin Italians
Federal Bureau of Incineration
Federal Bobcat Investigator
Federal Bureau of Intrusion
Far Behind Intelligence
Fat Bellied Inbred
Federal Bureau of Interconnection
Found Beer Inside
Fried Beyond Identification
Federal Bureau of Incompetence
Famous But Incompetent
Feeling Beer Itch
Friendly But Ignorant
File Bunglers, Inc.
Federal Bureau of Illusions
Frequent Blunders and Incompetence
Foolish Banner Investigation
Full Blooded Italian
Federal Bunk Inhalers
Full Breasted Italian
Friendly Bus Investigator
Federal Blonde Intelligance
Fools Bureau of Ineptitude
Federal Bureau of Ineptitude
Feeble Brained Incompetents
Fruity-Bearded Indian
Fat Big Italian
Frequently Bungled Investigations
Federal Bureau of Intoxication
Federal Bureau of Insubordination
Fender Bender International
Fumbling Bumbling Idiot
First Burnout Incarceration
Finest Bar In ....
Federated Bastion of Independence
Fools, Buffoons, and Idiots
Fat Barbies Idolized
Federal Booty Investigator
Fresh Blood Imaging
Features Benefits Information
Forget Bout It
Ferris Bueller Imitators
Community
Federation of British Industry (later C B I)
Full Blooded Indian
Fellowship of Bible Investigators
Fully Blessed Individual
Faith Being Investigated
Fabulous Babes of Interlachen
Fellowship Bible Institute
Future Basic Investigators
Four Basic Improvements
Fast Breaking Information
From Big Island
Faith By Intercession
Governmental
Federal Beuro of Investigation
Federal Bureau Investigators
Federal Bureau of Investigation
Fidelity, Bravery, Integrity
Federal Baseline Intelligence
Feeling Brutally Inclined
Find Boys Immediatley
Federal Bureau of Investigation US government
Federation of sodomite Iran
Federal Bureau of Investigationan
Academic & Science
Fine Boundary Interpolation
Fourier-Bros-Iagolnitzer transformation
Fungus, Bacteria, and Invertebrates
Foliar Browse Index
Computing
Frontend-Backend Integration
Friendly Bot Interaction
Fingerprint Biometric Identity
Fragged By Intelligence
Internet
Friends Beyond Infinity
Fully Blew It
Fine, Beautiful, and Intelligent
Fabulous, Beautiful, and Intelligent
Find Boys Immediately
Business
Flying Bike Industries
Farm Builders, Inc.
Free Broadcast Incorporated
Fizz and Boog, Inc.
Fantasy Based Idea
Feed Bag, Inc.
Farm Bureau Insurance
First Baltic International
Food & Beverage International