Top Definition
noun, plural onmitsu, countable
1) a ninja who is highly trained in the art of ninjutsu and is employed by his lord or the shogunate government
2) a Japanese secret agent whose job is to control public opinion using the Internet
3) a secret moderator of a BBS in Japan

noun, uncountable
4) stealth
No one notices onmitsu.
by Amamo-chan January 11, 2006

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