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 18, 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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short for nincompoop, a silly, stupid person. often used affectionately.
you went into the girls bathroom by mistake? you ninny!
by Shwaggy November 18, 2003
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Infantile, seemingly British, term for the female genitalia.
"Show me your winkle and I'll show you my ninny"
by Mr. Duffy January 18, 2008
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a pushover, like a noob.
Bobert: Wow, that kid that plays runescape is such a ninny. I stole all his money, ate his girlfriend, and fed him to a boar and he didn't even think twice about it!

Sam: Hey man, wanna play some b ball?
Cheechee: Well, I uh, I kinda wanna play some more runescape.
Sam: You fucking ninny.
by Ninny Barberino December 17, 2006
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1. a stupid or silly person, an idiot (from nincompoop)

2. a woman's breast (usually plural)
by The Return of Light Joker November 23, 2007
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