Where did the saying rat bastard come from?

Answer 1

The term "rat bastard" likely originated in the mid-20th century, combining "rat," often used to describe a deceitful or untrustworthy person, with "bastard," a derogatory term for someone born out of wedlock, implying illegitimacy or worthlessness. The phrase gained popularity in American English, particularly in military slang and among working-class communities, to express strong disdain or anger toward someone perceived as treacherous or despicable. Its use has since broadened to convey general contempt in various contexts.