Adj.
Full of ninjas or involving ninjas.

*Most commonly used in reference to an anime or manga, but is not exclusive to either.
1. Naruto is my favorite ninjaful anime of all time.
2. This years anime convention was the best due to it's ninjafulness.
by Melissa the random samurai August 14, 2006
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Another Word for Nigga,..
Also can be substituted for -- Bro, Cousin, Cuz, Dawg,Dude,.. etc.
1Whats up my ninja?
2Nothin much just relaxin.
by Z-Mo [Florida] June 2, 2007
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n. A Japanese warrior trained in secret techniques of espionage and assassination.
The word literally means 'patient person' (the kanji for nin being 'patience' and the kanji for ja being 'person').
The ninja skillfully extracted the secrets of the castle and assassinated the general, making war impossible.
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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 26, 2008
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A member of a class of 14th-century Japanese mercenary agents who were trained in the martial arts and hired for covert operations such as assassination and sabotage.

Acronym: Need Information Now Just Ask. A person who is an expert at something, or carries a great deal of knowledge about a particular thing.
The ninjas move swiftly through the palace.

Ask Daryl, he's the ninja to look for.
by Drewsef June 16, 2005
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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
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