When pronounced phonetically, MDFK becomes 'mudderfucker' a simple slang abreviation of 'mother fucker', a popular insult.
therefore, M.D.F.K=mother fucker
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from firstname.lastname@example.org. We'll never spam you.
Log in with Facebook to save your favorite definitions
and share them with friends.