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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A small, weak and middle aged woman-like person
Isn’t Tom such a ninny?
by Urbaaaaannnnnnnn May 6, 2020
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A small, weak, Middle Aged woman-like idiot.
Tom is such a huge ninny!
by Urbaaaaannnnnnnn May 6, 2020
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A term that is used to refer to someone who is being ridiculous, silly, or who is slightly off their rocker. Often used affectionately.
Mr. Holt, you are being quite a ninny today.
by bits99 May 4, 2021
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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 18, 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 24, 2007
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That chick is such a NINny she bought a blow-up doll and named it Trent Reznor
by AJ Kash August 21, 2009
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