Something that a ninja might say whenever he miscalculates something and makes an error.
"Whoops. Ninja mistake."
by Deus September 09, 2004
1 Word related to Ninja Mistake
Top Definition
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

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