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.
作者 lmao 2004年11月22日
1 more definition
1 Word related to Ninja Mistake
Something that a ninja might say whenever he miscalculates something and makes an error.
"Whoops. Ninja mistake."
作者 Deus 2004年9月09日

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