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It is the plural of no, this is what you use to say no to multiple questions
When I say niiioi I mean NIIIOI
Niiioi by Why_do_i_need_this _name November 13, 2019

niiiicccee 

A word used in describing things in a postitive manner.
1) Niiicccee I Won the lottery!
2) Shit that girls niiicccee!
3) Niiiicccee (on its own)
niiiicccee by Douglas4321 September 3, 2007

Steak Niiiiiiiight ! 

Adj. Used to describe a night you're really anticipating.
Ben and Eric see each other at work and loudly project: Steak Niiiiiiiight !

Side Note:
Must be immediately followed by the following words: "May your mushrooms always be sauteed and your onions grilled. Gravy."

Niiiiiiiiiiiiiiiiice 

Meaning extraordinarly nice. Way better than average.
That biyatch's ass is Niiiiiiiiiiiiice!!
Niiiiiiiiiiiiiiiiice by Shizzo April 12, 2004
to admire or to really like. Sometimes used to pretend you like something but you are actually just trying to be kind.

btw the word niiiicce has to have 4 i's, 2 c's and 2 e's otherwise it has a completely different meaning. for example, niicccceee spelt like that means "wtf, you are a total idiot. i hate you so much! get away from me now. IF you dont comprehend wat im saying to you then ill kill you and bury ur body then water the soil on top of you and grow plants there".

As you can see there is a significant difference if you spell niiiiccee incorrectly.
niiiiccee! i mean ive seen better, but that's definitely top 5.

eg.
Sam: look at this new mobile
John: niiiiccee
Sam:your just saying that
John: nahh its niiiiccee

eg.2
Sam: look at this new mobile
John: niicccceee
Sam: oh you slack ass!
John: what do u mean?
LATER THAT NIGHT
Sam: i love watering plants.... especially over dead bodies!
muhahahhahaha....
niiiiccee by niicccceee;) January 22, 2008
Something that is very cute. The littler it is, the bigger.
"My cat is a niinii"
niinii by gigigh April 11, 2017