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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!

Shadow Pirate Ninjitsu 

The ultimate and unheard of combat style that combines the power, skill and drunkenness of the pirates with the silent, deadly assassination skills of the ninja.
''have you heard of Shadow Pirate Ninjitsu?'' ''No, no one has, but it sounds awesome!''- Conversation overheard before both where quickly silenced.

ninjitsu 

Mispelling of Ninjutsu, the art of stealth CQB, practiced by the ninja.
"Although, NinjItsu and NinjUtsu sound the same, almost."
-me
ninjitsu by Dave November 5, 2004

Ninjitsu 

“To fold a shirt while a person is still in it”
“I’m going to ninjitsu Yo ass
Ninjitsu by Smickle pickle July 10, 2020

Nunjutsu 

A word use in neapolitan slang in italy, it is a gang fighing style created in Gragnano, the name is a parody of Ninjutsu.
"Fratm, t sfonn e mazzat co o nunjutsu .
Nunjutsu by Carlofumacrack July 12, 2020