Nico nico nii 

Serious definition: Nico Yazawa's catchphrase from the anime show Love Live! School Idol Project. Though this character seems mean and annoying at first glance, she uses this phrase often to cheer people up and show them that they don't need to feel sad, as they should always smile no matter the situation.

Nico nico nii~~ I'll nico nii your heart! I'm Yazawa Nico-Nico, and I'll put a smile in your heart! Remember, I'm Nico-Ni, and I love-Nico you!

Nico nico nii by ZAPBoy October 21, 2019

Nico nico nii 

The phrase mentioned by Nico Yazawa, a member of the idol group μ's (pronounced "muse") in the anime, "Love Live! School Idol Project". It can either sound really cute or really annoying to you. No in-betweens.

Nico: "Nico nico nii!!"

Umi: "stfu bruh"

Nico nico nii by Syahrul Danial August 30, 2020

Nico Nico Nii 

Every weeb phrase when meeting another weeb
Or

Cancer to everyone except weeb.

Nico Nico nii oni-chan

Nico Nico Nii by Shajanrai March 31, 2017

nico nico nii 

nico nico nii

nico nico nii

nico nico nii by Mandy Mouse September 25, 2019

Nico nico nii 

Its a meme and it’s a great meme but I don’t know it’s a meme and I also use it for something that is really cool

Person 1: did you see Jake help that falling kid

Person 2:yeah,he is such a nico Nico nii

Nico nico nii by Di meme lord January 6, 2019

Nico Nico Nii 

It is a Japanese term for "Say cheese"
It is a popular term amongst weebs as well

Person 1: "Hello can you take a picture of us"
Person 2: "Sure!"
Person 2: "Nico Nico Nii (Say cheese)"

Nico Nico Nii by Sangwoo_w33b October 23, 2020

Nico-Nico-Niice 

(adj.)

A term referring to that one person in your group who is a self-proclaimed friendly person.

1. pleasant; agreeable; satisfactory; all in a really contradictory way.

"I'm a very friendly person you may not think so but I normally am Nico-Nico-Niice"

Nico-Nico-Niice by AngelShinken January 3, 2019