F.B.I.

Face Book Idiot: A person whom you've never met, befriends you on Facebook, and after reading your comments and looking at your profile...thinks they know you, and begins to judge you as such. This person begins to comments on conversations you are having with "real friends" you know as if they know you. Seriously? This is the epitome of an F.B.I.

You know that guy that trolls me once in awhile? Well, he just commented on a conversation I was having with my brother and said something so unreasonable as if he knows me. Really? Let's hope this guy never ends up on a jury. Time to block him, he's an F.B.I.

by Gangster Barbie December 6, 2012

G.M.F.B.

Gay Mother Fucking Bitch

Dude, that guy is such a G.M.F.B.

by boogityboo May 16, 2010

K.F.F.B.

The acronym for the popular phrase in Newark DE which means Kyle Fucks Fat Bitches, referring to a person who prefers the company of larger women

Greg: Hey Kyle where ya goin'
Kyle: No where
Greg: ah, Sarah's
Kyle: fuck you
Judah: huh?
Greg to Judah: K.F.F.B.

by Lil Jud August 28, 2008

F.B.I.

Friendly
Bitches
Incorporated

Boy 1: Duude, that girl is such a savage. You think shes a part of the F.B.I.?

by mstachessayblank June 13, 2016

F.B.I

Full Blooded Islander. Pacific Polynesian Islander from Australia Or New Zealand.

What country is He from? Oh He's from Australia Or New Zealand F.B.I from Samoa.

by DJ Trap$tar July 10, 2017

M.F.B.

Monogamous Fuck Buddy
Refers to exclusive fuck buddies who aren't in a "relationship" but only fuck each other.

Are not obligated to do couple's activities, except sex.

"Hey, can we just be M.F.B.'s?"
"I'm her M.F.B."

by ak215 November 13, 2018

F.B.O

Fat Bitches Only

Aye Dawg did you see that F.B.O that bitch was Fo Hunnid Plus!

by Christian Wanner February 4, 2019