Shortened version of nincompoop, a silly, idiotic person. can be used affectionately.
you went into the girls bathroom by mistake? you ninny!
by Shwaggy November 19, 2003
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Quite possibly the coolest insult ever. Short for nincompoop, it was used often in Victorian Europe and early North America. Insult of choice for monocole-wearing gentry, and anyone with a bit of class.
My, what a ninny! *monocle*

Ninnies + potatoes = sign of good will?
by Rivviko September 10, 2007
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The most beautifullest person that has ever been alive. Also an amazing artist and a good friend for people who she loves.
Ninni is so talented
by Tadisti January 17, 2019
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1. An idiot
2. Short word for nincompoop
3. Someone who is afraid of everything and has no courage; see pansy
by Turd Ferguson January 29, 2004
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Female version of a Nincumpoop. Someone who is being silly, stupid or without reasonable thoughts.
Sarah you big ninnie, you just put your car keys in the ice box

Or

If Beth is a class clown you might say
Beth is a ninnie
by ddlD2 March 18, 2014
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short for nincompoop, a silly, stupid person. often used affectionately.
you went into the girls bathroom by mistake? you ninny!
by Shwaggy November 19, 2003
Get the ninny mug.