You fucked up, typically causing damage of property. Generally resulting in ridicule from close friends.
My sister totaled her car, she miffed it.
To be slightly irritated by something.
I was miffed by how curt my boyfriend was to my best friend.
Asia looks miffed, did something happen?
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To be slightly annoyed, specifically with someone or something.
Jane is a bit miffed with Sally.
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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.
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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: ;)
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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.
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