Similar to MILF "Mum I'd Like To Fuck", however MIF stands for "Mum I Fucked".
Harry: Kenny your Mum's a MILF

Kenny: Oi!

Ryan: Kenny your Mum's a MIF

Kenny: ....

Ryan: ;)
by Dyaaar December 12, 2009
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You fucked up, typically causing damage of property. Generally resulting in ridicule from close friends.
My sister totaled her car, she miffed it.
by sotsirh February 1, 2016
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See that blonde over there? She's my mif!
by RhodesNYC May 18, 2009
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A member of the venue staff asks if anyone is there for "RammSTEEN" at which point a fan corrects him with "RammSTEIN" and the guy becomes miffed.
by Colter October 31, 2003
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To be confused.
What are you going on about? I am completely miffed!
by Jennifer Tull August 27, 2003
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Steven:Kevin's mom is the ultimate milf
Garret:Nah dude shes a mif
Steven:What's a mif?
Garret:Mom I Fucked
by peaurgboipsgb May 26, 2007
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Something that makes you mad. From the word miff. Like "maddening" but that's not a word either. Or disappointing.
Also a form of the verb of 'miff'.
The lack of Killers' concerts in Northern Canada is absolutely miffing!

She kept miffing me off by trying to steal my copy of Hot Fuss!

I was in quite a miffing situation when the people were taking pictures of me and Brandon!
by Andrea June 8, 2005
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