mf

MF

1. vulgar slang An initialism of "motherfucker," meaning a despicable, detestable, or untrustworthy person. Typically only used in writing; not always capitalized. No, I won't lend him any money—that MF still owes me 20 bucks! I'm done responding to your comments, you stupid MF.
2. vulgar slang An initialism of "motherfucker," meaning an extremely problematic or unpleasant thing or situation. Typically only used in writing; not always capitalized. The problem is this little MF in the picture I just posted—it just won't fit in where the instructions say it should! I know it's a real MF, but you've got to play ball with the banks, or they could repossess your home!
3. vulgar slang An initialism of "motherfucking," used as an intensifier. Typically only used in writing; not always capitalized. I nearly mf screamed when I found out that I had won the lottery! Are you MF kidding me? How dumb can you be?

motherfucker

1. vulgar slang A despicable, detestable, or untrustworthy person. No, I won't lend him any money—that motherfucker still owes me 20 bucks! I'm done responding to your comments, you stupid motherfucker.
2. vulgar slang An extremely problematic or unpleasant thing or situation. The problem is this little motherfucker in the picture I just posted—it just won't fit in where the instructions say it should! I know it's a real motherfucker, but you've got to play ball with the banks, or they could repossess your home!
Farlex Dictionary of Idioms.

motherfucker

and MF
1. n. a despicable adversary; a moronic jerk. (Also a dangerous, derogatory, and provocative term of address. Taboo.) You stupid motherfucker! You’re gonna die for that!
2. n. a gadget; a part or thing. (Taboo.) This little motherfucker fits in right here.
3. and mother n. a problem or difficulty. (Taboo.) This test is a real mother.

MF

verb
See motherfucker
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • BYOM
  • WTG
  • HBU
  • YKWIM
  • CBA
  • DYOR
  • AITYD
  • CTFO
  • IANA
  • DNFTT