Prim or affected; over-refined; mincing.
I can't stand those mimsy shoegazer emo bands. Gimme a beer and lets rock'n'roll!
by Lo Topo December 3, 2008
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A person who behaves with inexpicable stupidity
For example a collegue who has deleted all your files by mistake , claiming they were eaten by wolves could be refered to as Mimsy - if they were to ever dare speak again one might reply "SHUT UP MIMSY".
by matman_uk July 16, 2010
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An imaginary friend, or one in the form of a toy. Or made of air.
Vote for me and I'll show you my mimsy.

My mimsy likes you.

I'll just run that past my mimsy.
by Shez March 8, 2005
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1) To be having so much fun that you don't care what is going on.

2)To just be really damn cool.

3)To do the robot to a Turf-Talk song, in front of random people just so that you can get some laughs.
1) Damn homie, I was getting so MIMSY at prom!

2) I just noticed how MIMSY that Jeff is.

3) I can't believe how tight JQ and Jeffrey are! They got so MIMSY at Convention for no reason!
by Fresh 2 Jeff May 31, 2006
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the last full cracker in a cracker box. In most cases, it is surrounded by broken crackers and crums.
YES!!! i found the last mimsy at the botton of my cheez-itz box.
by nate simon January 15, 2008
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Mimsy is a term of affection used for your mother

also spelled "Mimzy" or sometimes just "Mims"
Oh I'd love to go to the Hamptons, Norman, but I'll have to consult my Mimsy first.
by JFresh December 15, 2005
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An friend either made of air or some sort of cuddly toy you see as a good friend.
If you vote for me, I'll show you my mimsy.

My mimsy is extremely friendly.

My mimsy likes you.

Let me just run that past my mimsy.
by Shez March 8, 2005
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