moonbat

M3O1O1N1B3A1T1
/ˈmuːnˌbæt/

noun

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

Less commonScrabble 11

Meanings

nounmoonbat (plural moonbats)

plural moonbats

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

    Your job is to separate the media from the moonbats before some industrious cub reporter starts looking into our land deal.

    2009 October 13, Steve Eubanks, Downforce, New York: Harper, →ISBN, page 255
    2 more examples

    So, what do moonbat professors do when they're not attacking military recruiters, the Bush administration, cameramen, and College Republicans?

    2005, Michele Malkin, Unhinged: Exposing Liberals Gone Wild, Washington, DC: Regnery, →ISBN, page 108

    As nervous Bush supporters watched the president's approval rating slide, they unleashed their wrath on Sheehan, labeling the mourning mom a “crazy,” “anti-Semite,” “left-wing moonbat,” “crackpot” whose behavior bordered on “treasonous” and who was nothing more than a “hysterical noncombatant.”

    2006 May 11, Eric Boehlert, Lapdogs: How the Press Lay Down for the Bush White House, New York: Free Press, →ISBN, page 216

    Synonyms: leftard, libtard

adjectivemoonbat (comparative more moonbat, superlative most moonbat)

comparative more moonbat · superlative most moonbat

  1. derogatoryinformalgovernment(of ideas) Absurd or obviously untruthful.
    1 more example

    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.

Synonyms & antonyms

nounA liberal (someone with a left-wing ideology).

Origin

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).

Full word history & related roots →

Rhymes & wordplay

Anagrams

Cite this entry
APA

moonbat. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/moonbat

MLA

“moonbat.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/moonbat. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “moonbat,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/moonbat.

Source: moonbat on Wiktionary, CC BY-SA 4.0.