Noun; Mother Fucker Who Is In Charge.
An acronym; originated in the 60's. Denotes a person who has sex with mothers and is always in control of the situation.
Jim: Yo Tommy, this guy is cool.
Tommy: No Jim, this guy isn't just cool, he be the MIFWIIK.
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1. Adj; Used to describe a good situation.
2. An affirmation
Jim: Hey I just won the lottery!
Tommy: Sweet tits!
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