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)"

by Sangwoo_w33b October 24, 2020

I'm gonna break your nico nico kneecaps

What a weeb or otaku says when he's going to lay you out on the floor and he means it.

If I catch you trying to steal one of my anime figurines again, I'm gonna break your nico nico kneecaps.

by sebacostamr January 7, 2019

That's a line most weebs use, usually meaning that you should probably step back because this is a person looking for a fight.

You better give that All Might figurine back or 'Ima break your nico nico kneecaps'.