see historical character Lao Ai 嫪毐; by extension, person of reprehensible morals; immoral; adulterer

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嫪毐 嫪毐 lao4 ai3
Lao Ai (-238 BC), man of Qin famous for his giant penis; in fiction, bogus eunuch and the consort of king Ying Zheng's mother lady Zhao