Ultimate Ninja Destruction 

THE BEST GAME EVER,WHERE THE AIM IS TO HIT THE ANOTHER PERSONS HAND IN ONE SOLID MOVEMENT,AND THE PERSON YOU ARE GOING FOR HAS ONE SOLID MOVMENT TO DODGE AND YOU TAKE TURNS.

EMMA: I'M BORED

BRIANNA: LETS PLAY ULTIMATE NINJA DESTRUCTION

EMMA:AWESOME OK

Ultimate Ninja Destruction by BECA_ROCKS March 26, 2010

Awkward Ninja

When a person suddenly appears out of nowhere like a ninja and instantly makes you feel uncomfortable, often causing an awkward silence, then disappears just as quickly

First Guy: "Then, Tommy's friend just popped up out of nowhere and started listening to our conversation, no idea how long he was standing there."
Second Guy: "Then he disappeared next time you looked over?"
First Guy:"Yeah, how did you know?"
Second Guy: "He's an Awkward Ninja"

Awkward Ninja by SuperBambi May 23, 2010

Cotton Ninja

A racial slur for a negro. comes from when a negro disappears like a ninja when cotton is in the need of picking

Where did that Cotton Ninja go? He needs to get to work!

Cotton Ninja by Spear Chucker #44866 May 14, 2011

Research Ninja

When you see a hot girl in a YouTube video and you want to know who she is (obviously for research purposes), you ask that in the comment section. Then a Research Ninja volunteers, do his research, risk his life to stalk her on the internet and get you the information you want.

Person 1: Does anyone know the girl at 05:04? For research purposes of course.
Person 2: Her name is XXXX YYYY
Person 1: Thanks Research Ninja! You saved the day.

Research Ninja by totem_pole September 17, 2015

Ultimate Supreme Ninja King 

Function: noun
Etymology: Berkeley, 21st Cty; Japanese, from nin- persevere, conceal, move stealthily + -ja person; Medieval Latin ultimatus last, final, from Late Latin, past participle of ultimare to come to an end, be last, from Latin ultimus farthest, last, final, superlative of Latin *ulter situated beyond; highest in degree or quality; one that holds a preeminent position; especially : a chief among competitors

1. To be one with achieves the last word by executing oneself with active mental strength or force, to an ultimate and supreme degree of stealth.

The way in which Jüger just called out Rabbit's homoerotic tendencies definitely displays himself as the Ultimate Supreme Ninja King.

Ultimate Supreme Ninja King by Echoes (are lovely) April 29, 2007

Jedi Mind Ninja 

usually referred to as the acronym JMN, its when you and another person think or say the same thing at the same time. Its like the person is reading your thoughts.

L: Whoa, I just went on the board today and its like a ghost town!

T: JMN (Jedi Mind Ninja), I thought the exact same thing when I saw that!

Jedi Mind Ninja by aaddicted May 24, 2009

ninja mcduff 

Ninja mcduff is a character in an online MMORPGcalled Tibia. His soul purpose is to steal your loot bags, money and all items he can get a hold of. If your hunting he won't respect you and will kill your monsters. He should not be trusted, he is one of the best ninja's on the server Luminera. His skills are wildly unmatched and he spends most of his time talking to random people. Born out of spite, and the need to make people around him miserable, Ninja Mcduff has been recking havoc for a little over a year.
Things known about ninja mcduff include. Modeling, partying and working at abercrombie, while not playing Tibia.

Player Dave {46}: Hey man my loot bag
Ninja Mcduff {126}: Yea i know thx.
Player Dave {46}: plx man , mines loot plx!!!
Ninja Mcduff {126} : Offer?
Player Dave {46} : Br?
Ninja Mcduff {126} : Learn english!!!!! (throws bag in water)

Today was bull crap, i lost all my home work, i was ninja mcduff'd.

Hey stop acting like Ninja Mcduff, that guy is nuts.

ninja mcduff by Ninja Mcduff June 30, 2008