mfcsb 

Motherfucking Cocksucking Bitch or Motherfucking Cocksucking Bastard.

Flat out one of the best ways to make fun of someone. It means exactly what it stands for.
Developed by myself.

Dude1: Yo, dude, it looks like u put some weight on!

Dude2: Bull shit, you MFCSB!

mfcsb by _OMEGA_ September 8, 2008

MFSB 

I:

MOTHER
FUCKING
SON of a
BITCH

II:
mother
father
sister
brother

-classic musical act

MOTHERFUCKING SON OF A BITCH!

MFSB... whatever happened to them?

MFSB by Bravely Folk December 23, 2003

mfcssoamfb 

abbreviation for mother fuckin cock suckin son of a mother fuckin bitch

generally used by people who swear to much bcaz they dont pay attention in english so they dont know any other words

(in a text message) omfg u mfcssoamfb

mfcssoamfb by tyjofi14 May 6, 2008

MFCS 

MotherFuckerCockSucker
This is a more "mixed company" friendly way to express the above expletive. This can be used as an adjective but it's more commonly just used as an angry outburst.

"That MFCS just rear-ended my new car!!"
or
Joe - "Hey, Tom, I just saw Pete with his tongue down Kelly's throat. Isn't she supposed to be YOUR girlfriend?"
Tom - "MFCS!!!!!"

MFCS by GhostFaceGirl October 26, 2005

MFCB 

acronym for mother fucker cunt bag

damn you mfcb weather

MFCB by ceroween February 24, 2011

MFSB 

MOTHER
FUCKING
SHIT
BALLS

Derek - 'Oh my MFSB'
Mr Bolokov - 'What does that mean?'
Derek - 'Mother Fucking Shit Balls'

MFSB by Ujanika Bolokov February 13, 2023

MFCS 

Multiple Facial Cock Slaps

In the porno that Josh rented, it showed graphic acts of MFCS.

MFCS by radio November 22, 2003