(noun) One of those girls that you always see at college parties who is between the ages of 15 and 18. One second she is up and about and yelling "its my song!", the next she is puking or making out with a 30 year old.
That ninny spilled her drink on me. That ninny bitch.
by bayneofitall February 20, 2013
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Southern slang. None. A null set. Generally incorporated to complete a sentence defining being without.
You got rubbers?

No. Don't got ninnie.
by jiminton July 28, 2012
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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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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 2, 2011
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Another word for Boobs or Breasts. A less grotesque way of addressing ones rack.
Your ninnies are looking mighty fine today.
by Kayla Sue August 3, 2008
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Current/former Nine Inch Nails fans (hence, the "NIN" part of "ninnies") who originally met through the Net (old-school ninnies trace their roots to the alt.music.nin Usenet newsgroup, while more recent converts have been acquired through IRC, Live Journal and dating/marrying other ninnies), and who now get together periodically to consume prodigious amounts of meat, alcohol and curiously strong brownies, wear Reznor heater shirts and bondage gear, perform cutting-edge karaoke, and comandeer hotel lobbies 24/7 for shooting the bull, freaking out mundanes, making more bad in-jokes than was previously thought humanly possible, and impersonating N'Sync roadies.
Trent? We don't need no stinkin' Trent--we're ninnies for life, with or without him!
by Robin the mad photographer January 30, 2005
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Person1: look at that stick
Person2: its a ninni
by dickstar123 March 24, 2021
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