FMB

Fuck my Butt

why are we playing in this gay baseball league...FMB (FUCK MY BUTT)

by DISUBURBIA June 21, 2008

FMBS

see also, CFMBs

by gatch February 26, 2003

fmbs

Slag wellies

Jim, look at that tart in her slag wellies

by rob April 30, 2004

FMB

Fuck Mad Bitches

Wow Tom! Let's go FMB all night!

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"

by William Woody September 6, 2005

FMB

From My Butt

"LOL FMB"
(I just farted)

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.

by Hetalia_Trash July 28, 2016