Moonbat
adj, noun, slang ·Moderate ·College level
Definitions
- 1 A liberal (someone with a left-wing ideology). derogatory, informal
"So, what do moonbat professors do when they're not attacking military recruiters, the Bush administration, cameramen, and College Republicans?"
- 1 (of ideas) Absurd or obviously untruthful. derogatory, informal
"20204: The Bulwark Trump, who said last month at the Republican National Convention that he would never again retell the story of the attempt on his life “because it’s too painful to tell,” told that story with relish. He expounded at length on his usual moonbat fables about how countries around the world are emptying their prisons and mental institutions to send their convicts and lunatics to the United States."
Example
More examples"So, what do moonbat professors do when they're not attacking military recruiters, the Bush administration, cameramen, and College Republicans?"
Etymology
From moon + bat. Originally the name of the XP-67 experimental aircraft, developed by McDonnell Aircraft in 1941. Used in the 1940s by the science-fiction writer Robert Heinlein, then used in the term “barking moonbat” coined in 1999 by Perry de Havilland of “The Libertarian Samizdata”, a right-libertarian weblog. This originally referred to both left-wing and right-wing crazy people. Sometimes wrongly claimed to be a corruption of Monbiot (from George Monbiot, British environmentalist and Guardian columnist).
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.