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1. Ninja Mistake
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 Nov 22, 2004 add a video
2. Ninja Mistake
Something that a ninja might say whenever he miscalculates something and makes an error.
"Whoops. Ninja mistake."
by Deus Sep 9, 2004 add a video
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