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.
dari lmao Senin, 22 November 2004
Something that a ninja might say whenever he miscalculates something and makes an error.
"Whoops. Ninja mistake."
dari Deus Kamis, 09 September 2004
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