m.f. 

abbrev. a "mother fucker"

who is the m.f. who stole my bagel?

m.f. by Doobie March 22, 2004

M.F. 

Word for the girl you sleep with and refuse to call her, unless its for more sex. Also a way for friends to notify other friends when the booty call is in the vicinity.

Guy 1: Dude did you see M.F.?
Guy 2: Yeah! She walked by your job, and was looking for you.

Guy 1: Ok, shout out M.F. if she returns.

M.F. by jewish213124 November 20, 2009

m.f. 

aka mold farm. A perfect place to hide rotten ravioli and popcorn kernels as well as any other random shit you may encounter in your fridge. this may include milk, pancakes, vinegar, bread, eggs, and CLAUSSEN pickles. beware of maggots and older, slightly more mature people finding it in a cabinet in your basement.

The kids parents were f-ing pissed when they found that bad-ass m.f. in the cellar because it smelled like corn chunkidge.

m.f. by DJ and Caroline April 17, 2007

m.f. 

willem dafoe

that willem dafoe is a m.f.

m.f. by Mantastic March 25, 2004

M.F. 

Acronym for Mother Fucker

Harry: I got caught by my mom jerking off last night
Jason: Why the fuck were you doing that you sick M.F.?

M.F. by Sh*tsticks May 19, 2018

m/f 

People say on chats to learn whether you are male or female. After this question, they may say 'Fuck You' or 'Suck Your Balls'.

<Your>hello!
<Stranger>m/f
<You>female.
<Stranger>fuck u!
Disconnected

m/f by fake hazard August 16, 2009

M F

This is a term for Mother F*cker or Mother F*ckin that can be slipped into any abreviated or slang phrase without offending the majority of the public.

I really need to know if you can attend this party A-S-A-M-F-P! Hey Johnny, Did you get that M Fin' car started yet? <> For the ultimate effect, add a G D before the M F to abreviate God D*mn Mother F*ckin for ultimate stress relief without offending. EX Hello, I'd like you to meet my G D to the M F boss Mr. Sucabut.

M F by goatofcolors October 6, 2006