noun
lonely single man; male virgin; loser (male)
Internet slang abbreviation of 独身男性 (single man). Often carries a derogatory or self-deprecating nuance, implying a man who is unsuccessful with women, socially awkward, or a 'loser'. Can also refer specifically to a male virgin. Usage is informal and primarily online.
See also: 独身男性
ネットでは、彼のような独身男性を「毒男」と呼ぶことがある。
On the internet, single men like him are sometimes called 'dokuo'.
毒男を自称する人もいる。
Some people call themselves a 'dokuo'.
Abbreviation of 独身男性 (single man), with 独 replaced by the homophonous 毒 (poison) for a derogatory or self-deprecating effect. The exact origin is uncertain, but it emerged in Japanese internet culture.