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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I was miffed by how curt my boyfriend was to my best friend.

Asia looks miffed, did something happen?
by PuttingItSimply August 23, 2017
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To be slightly annoyed, specifically with someone or something.
Jane is a bit miffed with Sally.
by Katie October 8, 2003
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a MIF is a MILF without the L.
In other words, a mom that I fucked.
charlie: Damn look at Michele's mom she is such a MILF!
Me: Nah, she's a MIF on my list.
by osco50 March 14, 2008
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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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