Nico nico kneecaps 

A very big threat, if someone threatens your nico nico kneecaps you best be runnin. Holds power over the reverse card. Unless you have Danny Devito on you, you're screwed.

This man breaks nico nico kneecaps, aight ima head out.

Nico nico kneecaps by Loaf that's not buttered yet November 25, 2019

Nico Nico Kneecaps 

A phrase used out of annoyance when someone says "Nico Nico Nii" one too many times.

Person 1: Nico Nico Nii!
Person 2: Nico Nico Nii!
Person 1: Nico Nico-
Person 3: Dude. If you don't stop, I'm gonna break your Nico Nico Kneecaps.

Nico Nico Kneecaps by LiterallyBored March 26, 2022

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.

I'm gonna break your nico nico kneecaps by sebacostamr January 6, 2019

Ima break your nico nico kneecaps 

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'.

Ima break your nico nico kneecaps by azsxsdedcsawqwertygbnhjiokmk;' February 3, 2021