ninjun 

A slang term combining ninja and injun, used to describe Native Americans depicted as having superhuman fighting skills. The term is generally applied to popular film depictions of Native American combat prowess, such as "Brotherhood of the Wolf," and seems to have begun with "Last of the Mohicans."

Dude, that ninjun totally did a backflip onto that dude's head and then threw a tomahawk into his partner's face, then he did a spin kick and knocked the sheriff off the side of a cliff!

ninjun by Talmanes November 5, 2005

Ninjuice 

When you earn some street cred as a 90s style Ninja fighting a minotaur in a flannel shirt.

Also a very painful beverage that tastes like a punch to the face.

Make sure you don't get the ninjuice, it will knock you out.

Ninjuice by Mark SF June 6, 2007

Conservation of ninjutsu 

A law of the Universe, that states that there is a finite amount of ninjutsu available to each side during any given battle. If there are many ninjas, they are all awarded a fraction of the total ninjutsu, or 1/N where N is the number of ninjas present in the fight.

This is the reason why hordes of ninja warriors will be dispatched relatively easily, whereas the lone ninja is almost unstoppable.

Practical applications of the law of Conservation of ninjutsu:

Sir! There's an army of ninjas heading this way!

Don't worry, we can take them.

Oh wait... it seems they've given up, sir. There's only one guy.

GOD DAMN IT RUN!

Conservation of ninjutsu by Kirbytroid June 5, 2011

Ninjin 

The Coolest Carrot the world is ever seen

penis

The Coolest Carrot the world is ever seen

Kid "OMG NINJIN U A CARROT"
Ninjin "ye"

Kid 2 "I feel like eating a Ninjin"
Ninjin "OMG PLZ NO EAT ME"

Ninjin by JayIsKool69 October 4, 2016

Ninjutsu 

Ninjutsu is the ancient art of the ninjas (Aka shinobi) of Japan. It is a unique method of moving and thinking which developed our system often referred to us the art of winning. Taijustu is the basic defence method used. This method of relaxed continues body movement allows the user to create a never ending supply of effective counters to any given defence situation and is unique to Ninjutsu. Ninjutsu is a complete fighting system dealing with the Physical, mental and spiritual aspects of student development. Techniques cover locks, throws, ground fighting, multiple attacks, modern weaponry, and all types of traditional Ninjutsu weaponry. In fact in Ninjutsu, there is no restriction on the type of available technique we can add on to our taijutsu. The power of this relaxed system has to be experienced to be appreciated.

Ninjutsu did not come into being a specific, well-defined art in the first place, and many centuries passed before Ninjutsu was established as an independent system of knowledge in its own right. The Ninja, at the beginning did not use that label for themselves, they were merely practitioners of strategies that were cultural opposites of the conventional outlooks of the ruling Japanese Samurai class. Their highly illegal counter culture went underground and it was for this reason alone that the art was shrouded by centuries of mystery and deliberate confusion in Japanese history.

Ninjutsu by Dancing with Fire December 30, 2010

ninjaneer 

An expert engineer class for Team Fortress 2. One who can ninja through the enemy offensively to create a dirty sentry, or find a nice home defensively that the enemy can't overcome.

That {oBs} clan sure is full of ninjaneers!

ninjaneer by {oBs} October 18, 2009

Ninjing 

Displaying the abilities or likeness of the ninja.

Last night, no one knew we were present, which was in large part due to the fact that we were ninjing in the shadows.

Ninjing by Nine Lives Co July 18, 2018