MMFB 

Mean Mother Fucker Blues, a tune by Angry Johnny and the Killbillies.

I woke up one morning, and I kicked my dog
I beat my neighbors skull in with a big ol' maple log
I called his big fat hairy wife a big fat hairy slob
I had the blues
The Mean Mother Fucker Blues (MMFB)

MMFB by psychobilly1000 September 10, 2011

MMFB 

Make me feel better. Often used on Reddit.

I just got dumped, lost my house and my cat died all in the same day. MMFB

MMFB by liz6969696969 January 4, 2012

MMFB 

Make Money Fuck Bitches

As in the way of life of a true gangsta. In the words of Lil' Wayne, "I be makin' money and fuckin' bitches". It is a way of life, whether gangsta or businessman. MMFB is what the best of us do.

MMFB by MMFB For Life December 27, 2008

mmfb 

mmfb stands for my mother fucking box. It is a term used by soccer goalkeepers. It refers to the box they are allowed to pick the ball up in. The term means no one can come in and score a goal because it is the goalkeeper’s mother fucking box.

The goalkeeper took out the striker because they entered his mmfb.

mmfb by Ghzjsjwhdvbsh October 20, 2018

MMFBF 

An acronym signifying one's Most Masturbate-able Facebook Friend

She's got some nice bikini shots on Facebook now, she's definitely my new MMFBF.

MMFBF by timpanum December 20, 2014