FMB 

Fuck Mad Bitches

Wow Tom! Let's go FMB all night!

FMB by Delboy99 April 17, 2015

FMB 

Fucking Man Boobs

The act of rubbing your penis all over an older mans boobs. Works best with chest hair.

"Dude, me and Bob had such a good time FMB all night"

"I like FMB, its the only thing I live for"

FMB by William Woody September 6, 2005

FMB 

From My Butt

"LOL FMB"
(I just farted)

FMB by BUTTMOLE June 18, 2010

FMB 

Has multiple meanings, but my favorite definition for this is:

Flying Mint Bunny.

One of England's magical, "imaginary" friends. (His favorite) Nobody else but Norway and Iggybrows (England) could see her.

England: Hello, FMB!

Norway: Oh, she's cute. Can I pet her?
England: Sure.

FMB by Hetalia_Trash July 28, 2016

fmb 

Fat Mall Bitch.
The hottest ladies on Long Island.

The FMBs came to bring tha pain.

fmb by Lauren January 24, 2004

FMB 

Acronym for Fuck Mad Bitches*

*Note: Tense of "fuck" may be changed to reflect proper grammar

"What are you up to tonight?"
"FMB"

FMB by Kepabar May 3, 2005

fmb 

Fuk my but.

Hey bro, you wanna FMB?

fmb by BillyRayJohnson February 5, 2004