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moonbat

Pronunciation: /ˈmuːnˌbæt/

The English word “moonbat” has 2 meanings listed here.

noun

  1. A liberal (someone with a left-wing ideology).

adjective

  1. (of ideas) Absurd or obviously untruthful.

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…

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.