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An abbreviation of "mother fucking arsehole", 90% of the time male. Usually used in online conversations and handphone text messaging (or sms) to save time typing.
Girl A: he cheated on me!
Girl B: he wat?! tt mfa!
Girl A: n he owe me some $
Girl A: MFA!!!
mfa by Fat Rabbit July 21, 2005
Related Words
MFA MFAM mfactor MFAL Mfalme mfana MFAP mfa bombing mfaa mfaakms
My Fcukin' Ass

Which can be used as a good or bad thing depending on situation and the way it is said.
Good: MFA that was a brilliant headshot

Bad: MFA you're good in bed (Sarcastic)
MFA by Stevey January 7, 2004
mother fucking annoying. to describe a person that doesn;t leave you allone; EVER.
Jesus, that girl needs a life. She's so mfa!
mfa by juju fluffy April 26, 2010
Her: "WTF are you trying to do to me?! This says 'may cause a laxative effect'! Apparently, it's so intense you shit yourself."

Me: "Lol. I'm sure that's it. A clean bowel is a happy bowel, amirite?"

Her: "THAT was your plan! Making ME break the poop silence"

Me: "Lol. MFA"
MFA by Skittles x March 12, 2012
"Kevin is MFA"
MFA by samburn$ December 27, 2008