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11.
1.a set of useless tits. (any tit that does not produce milk)

2.man nipples

3.also used to describe super slow people, or people with no common sense
ex.

1.That old ladies tits are about as useless as ninnies on a boar hog.

2.damn, did you see the ninnies on Tyrone? Homeboy is smugglin' raisins!

3.Those new guys are complete ninnies.
by whtrice January 01, 2011
 
1.
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
 
2.
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
 
3.
1. An idiot
2. Short word for nincompoop
3. Someone who is afraid of everything and has no courage; see pansy
You are such a little Ninny!
by Turd Ferguson January 29, 2004
 
4.
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
 
5.
nincompoop, idiot, moron, Piers Morgan
Piers is a big Ninny
by SusanHarHar October 02, 2010
 
6.
Small sized breasts
Most women are unhappy if they have ninnies
by Fisher March 23, 2004
 
7.
a Finnish term for breasts
My lady has nice ninnies.
by Wadeskie June 23, 2006