Nonjitsu 

The art of trying to act like a ninja, but infact failing due to non-ninja status. Ninjitsu + fail = Nonjitsu.

Chris preformed some of his Nonjitsu when he tried to climb that building and fell and broke his arm.

Nonjitsu by tutyakbi March 8, 2011

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.

Shadow Pirate Ninjitsu by skyhunter70 December 17, 2011

Notjitsu 

The dark art of Internet Fighting. The technique of claiming great feats of wealth, intelligence, strength, and sexual prowess on internet forums despite not actually having wealth, intelligence, strength, or sex. This is done to one up fellow internet users and claim a position of dominance over them and hopefully garner yourself much deserved attention.

You can bench 600 pounds eh? You must study Notjitsu.

Notjitsu by Wally McMillan January 6, 2008

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