similar to tatas, but smaller
damn, those ninis are smaller than my fist!
by Mattwick December 14, 2004

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the most Ching Chong rack of tatas that you'll ever come across
lily: damn those ninis really Ching my chong
tash: yeah! they're my cup of noodle soup!
by tacosburritos November 12, 2014

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a bitch who thinks shes tough but really isnt. always sucking dick. usually someone very young and immature.
Mary is such a nini its ridiculous.
by GangPullin September 11, 2016

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the pressiest most hottest girl
Nini is the the niniest girl
by fnsdfr June 08, 2003

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Pronouced: Nie Nie
A friendly, yet unsexual, way of messing around with a fellow friend by taking your hand and shoving it as far up into the ass as it can go and then rotating it so that the hole is feeling intense pressure so that it forces the person being ni nied to squeze their butt muscles together and succomb to the host. This is all done with clothes on.
"If you annoy me one more time, I am going to come over there and give you a ni ni!"

"I heard last night that she got totally ni nied!"
by Topher Ducce July 30, 2008

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nini is short for the word night night. it is a state of mind. when one is nini, one has that delirious state of mind, one laughs at himself because of the simple fact that one is extremely tired. when one is nini, one must immediately find a bed to take a nap or fall into a overpowering and fulfilling deep sleep. NINI also has its own language. To some it may sound like a bunch of giberish, but to those who understand the genius of nini it is a very powerful and meaningful experience to speak it.
man, im so tired, im about to go nini.

man you look worn out, you must be nini
by iceboxshorty July 02, 2010

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a peculiar sexual phrase said when a male or female climaxes, it can be used as a noun or as an adjective.

nini nation refers to having multiple sex partners at the same time
"Last night we fucked so much I could barely scream nini anymore."

"The sex was straight up nini."

"I did three guys last night, at the same time. I am now a citizen of nini nation."
by Big Nini June 27, 2010

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