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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Home-made artificial vagina.

Making a wanking aid out of household objects, such as a child's armband under a sofa cushion, or your sister's guinea pig wrapped in tape to avoid it splitting.
Get me some tape, I'm going to make a squeaking mimsy
by Youwerewrongedgy March 24, 2011
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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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A charming, feminine woman that's glad she's a woman. The opposite of a third wave feminist.
I'm so relieved that my girlfriend is a Mimsy.
by mimimarceau April 21, 2019
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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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