Dokuo
From Infogalactic: the planetary knowledge core
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Dokuo (毒男?, literally "poison man") is a Japanese slang term for single males, which originates on the 2channel internet textboard.[1][2] The term derives from the Japanese dokushin otoko (独身男?)[1] or dokushin dansei (独身男性?).[2]
The Chinese song "Love and Honesty" mentions dokuo.[3]