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5.
Ninja were people of feudal japan trained in Ninpo or Ninjutsu. It was possible to use skills learned in assasination-which was done, but not coldly. Ninja's were japans peace keepers and information gathers-they would assasinate political powers that threatned peace of japan, and would often be recruited by a higher power (such as a warlord like Oda Nobunaga, or Ieyasu Tokugawa) to spy on enemy's and gather information. Ninja were originally called *Shinobi*, literally translating into a expert at information gathering. Ninja groups were divided into families and clans. The two regions were Ninjutsu developed and Ninja were founded were Iga and Koga provinces. there were roughly 53 subgroups of Koga and Iga. One of the most famous Ninja in history was Hattori Hanzo-a famous warlord and Ninja of Iga.
Random facts:
In 1676, the book Bansenshukai about Ninja methods was written by Fujibayashi Yasutake, a Samurai of Iga castle.
In 1681 the book Shoninki (correct Ninjutsu memories) was written by Fujibayashi Masatake.
In 1653 the book Ninpiden meaning secret teachings of Ninjutsu was written by Hattori Hanzo Yasunaga.
There were very few ninja-when oda nobunaga attacked Iga, 80 ninja fled.
Genbukan and Bujinkan are the only organizations keeping true Ninjutsu alive today.
Ninja didnt wear black very often-they wore deep red or dark green when on missions, and in winter snow, White.
Ninja were often Samurai too-afterall its only Title, not material.
Ninja didnt actually use straight swords much-only when they were desperate. After ninja had established themselves, they could use curved blades.
Other names used for ninja were Kancho, Shinobi, Kusa, Sppa, Rappa, Tsuppa, Mitsumoto(Kembun, Metsuke, Kaiken). Kyodan, Kanja, Choja, Shinobi no Mono, Onmitsu.
Ninja arent magical, they just understood sciences more advanced then the rest of the population of the time.
Ninja couldnt fly.
Ninja couldnt perform supernatural stunts.
Ninja can evade swords.
The Ninja stealthly entered his home.
by Ninpo-Bugei July 28, 2006
 
29.
crazy ass mother fucker blackbelt who can whoop your butt without you even knowing they are there. Crazy skilled, stealthy, never seen. usually teens and mid 30s. Quick moving and very effective.
We are some of the most nastiest ninjas in the world.
by ray-cait-whatev April 03, 2010
 
30.
verb. To bail on a group of friends without any warning, only to return many hours later.

One may do this as a premeditated act to see another group of people, or as an unintentional byproduct of being drunkenly inconsiderate to your crew.
Dude, Brian ninja-ed us last night. We were walking to the party and he bailed to hook up with that skank.
by GKenns February 10, 2009
 
31.
To insidiously and calculatedly disseminate massive quantities of misinformation in order to completely obscure and divert attention from the real meaning of something nefarious.

Hack.
The real ninjas ninja'd the popular websites and online dictionaries with bogus information about ninjas. By doing this, they diverted attention from the cryptic underground hacking book about ninjas entitled "Real Ultimate Power."
by ham-man July 10, 2008
 
32.
What was once a proud feudal Japanese assassin renowned for its ninjutsu skills and martial arts/weapons training now reduced to American five-year olds reenacting what they see on Naruto and getting injured for it. Ninjas formerly trained in clans or legions. Now they go to school in an academy to better relate to American children. Weaksauce =(
I'm gonna be a NINJA! Believe it! Watch this, mom! It's not dangerous, I saw it on Naruto!!!
by mechademon5 February 25, 2008
 
33.
Ninjas In Need, Just Ask Foundation.

The fundraising branch of the Secret Ninja Society. You probably haven't heard of it, it's that secret.
I just got a call from some guy collecting donations for the N.I.N.J.A. Foundation. I totally gave them 3 bucks. Now I get to display a ninja star on my bumper to show everyone I donated!
by kurticus May 21, 2007
 
34.
the definition for ninja can not be found. we are not sorry for the inconvenience.
no ninjas here
by west&carver November 27, 2010
 
35.
a free runner who is so sick he could just be a descendent of a ninja,
a person who is amazing and sneaks outa no where
the guy who always wins in hide and seek
but is never found
DUUUDE did u just see that guy, i swear to god hes a frikin ninja
dude i hate john he always wins hide and seek AND HE DOESNT EVEN COME OUT WHEN WE YELL GAMES OVER
damn that guys so ninja he drinks salt
outa a sippy cup
by KIZzla February 20, 2009