Someone who aspires to be a ninja but never will because of their failing attempts, every time. They can also be referred to as a poser.
Johnny wanted to be a ninja but he couldn't due to his sucky ninjaness. All the little ninjas laughed at him and called him a ninjaring behind his back. Johnny was sad.
by fuckingay August 17, 2006
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The act of tieing a black t-shirt around your head and pretending to be a ninja hiding behind walls from cars and climbing on buildings.
Im going to ninja the village and steal a prize from (insert name here)garden
by Daniel Read May 30, 2005
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Also known as "Paco". The perfect example of a dedicated gay man. Comes in green, blue, and technicolor.
First Man: "Who is this?"

Second Man: "My Ninjar."
by ilikegay August 13, 2008
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To be a ninja at all times. Doing ninja shit when others are just doing normal shit.

To remain stealthy.

Sneaky, stealth like trick shots.

Weapon building. Ninja star throwing. Sword slicing.Discpline Distraction Dojoless Dopeshit
Silent like a ninja, skillful and stealthy, he snorted the line without security seeing, that's ninjarism
by Small town crook November 21, 2019
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To perform a trick with such skill that you appear to have ninja like tendencies
That was marvellous I must say! You dealt with that Ninjarously Tomie
by Definedwell97 February 03, 2016
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