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Short for Mother Fucker, Someone who is a total bitch.
That MF Ugly!
MF by StraightGirl6060 September 5, 2018
Related Words
MF MFC mfb MFG mfs MFW MFer MF Doom MFM MFL
mf has 2 meanings, often used as:

(i) Mother Fucker
(ii) My Friend

definition (i) is more commonly seen in chatrooms; whereas definition (ii) seen in multiplayer games.

if someone uses mf towards you, it's best to pretend you dont understand, so they will explain - either (i) or (ii). Since you dont want to just start insulting them.
Example:
<Shinosuke> Blah.. lets stop the conversation.. I dont want to talk abt it anymore.
<Person1> ok mf.
<Shinosuke> mf?
<Person1> mf - my friend.
<Shinosuke> Oh.. ok.. i thought.. nvm.
mf by Shinosuke May 13, 2004
this word is used when youre tryna describe someone who hurted you so bad you can't even say his name. You call him "mf" short for mother fucker because he is the worst fucking person, he fucking played your feelings, he led you on, he made you fall for him, then he'll leave you with the "let's just be friends" so yeah fuck him.
Me: im boutta throw my goddamn hands on that mf
mf by realassbeach March 20, 2019
You're a stupid mother fucker if you don't know what MF stands for.
MF by Falken January 17, 2003
Wassup MF
What?!
"Motherfucker"
MF by Laura231 April 1, 2019