Top definition
(9) or nine-ball.

In the game manual of Touhou's 9th game (東方花映塚 ~ Phantasmagoria of Flower View), Cirno, pitted as the second player character, was labeled as "⑨" - it stood for バカ ("baka" - "idiot"). Ever since, ⑨ gained notoriety as Cirno's nickname.
Don't be such a ⑨!
by redtails April 14, 2010
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