Its an adverration used by Bikers like Hells Angels and Banditos. On a Bikers Vest there is a "1%" badge, that came from an American President
speach were he statet that there were 1% of the population that was scum/unwanted.. after that Hells Angels began wearing the "1%" badge
-symbolising them being that 1% of scum.
Birkers also have a saying, example "AFFA = Angels forever, forever Angles" , Bandidos and other Biker groups have the same like BFFB, and like
yours MFFM..
Hope this answers your question