ninjitis 

An STI that slowly overtakes all brain function and at the same tame amplifies many specific brain waves. These brain waves increase hand eye coordination, motor function, reaction time, and overall lethality. Through lab testing this dreaded infection has proven to leave the afflicted with an overwhelming desire to hide in shadows while wearing all black. The disease was named "ninjitis" because in extreme cases the afflicted have been left with an additional need of seeking training and becoming a full ninja.

I think Kyle has ninjitis. I never see him anymore and he's always wearing black.

ninjitis by blizzard55555 July 30, 2009

ninjitis 

A viral infection transmitted by Ninjas and Ninjinas. Unknown in origin, this mysterious disease will be around just as long as those damn lazy ninjas

that ninja snuffed my duff now i have to get two shots in my throat every day to keep my ninjitis at bay

ninjitis by bob hastills October 10, 2005

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

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