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2.
Something that a ninja might say whenever he miscalculates something and makes an error.
"Whoops. Ninja mistake."
by Deus September 09, 2004

Words related to Ninja Mistake

fate
 
1.
Something that doesn't exist.

Apparently, fate and Ninja Mistake are one and the same.
Ninja do not make a mistake, you fucktards.
by lmao November 22, 2004