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A liberal, progressive, or left-wing person who promotes irrational conspiracy theories involving conservatives.
Helen is a moonbat - she thinks Ronald Reagan ordered the murder of John Lennon becuse of Lennon's anti-war views.
by vonTrips August 29, 2009
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Oct 29 Word of the Day
When you meet with someone without anyone knowing except you and the person.
by Timbs March 08, 2017
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Moonbat (1) (n) Irrational and Mentally unstable persons of a decidedly liberal political affiliation;
(2) (n) Someone on the extreme edge of whatever their -ism happens to be.
Human Shields are Moonbats!
by Dashing Dasher October 16, 2004
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A mentally unstable Liberal who tires to hijack the true meaning of a word and turn it to their advantage. Just as they have with History.
The true definition of Moonbat is not a compliment to Liberals. It is a term used to describe their mental instability and lack of knowledge.
If you tell the same lie over and over again eventually people will start to believe it. Moonbats are notorious for telling those lies and for believing them. Look at the actual history of Congressional voting record. The Liberals have a bad voting history. They were the biggest opposition to the abolishment of slavery. Yes the Republicans freed the slaves. Liberals were the biggest opposition to women’s rights and they were the biggest opposition of the Civil Rights Act.
Their Congressional voting history proves it.
Moonbats need to pay attention to the history of the KKK. It was the so called liberals who founded the KKK. Yes that is right, it was founded by so called Democrats and they have a long documented history in the KKK.Liberals seem to have forgotten the KKK was founded in the south and back then the south was all Democrat.
These are all examples of how they have told the same lies for so long that mentally unstable people believe their lies.

by Tav68 October 29, 2007
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An unthinking or insane leftist -- in other words, most modern leftists.

Moonbat can also be used as an adjective, e.g. a moonbat professor. According to the Wikipedia entry for moonbat, the word was coined in 2002 by the Editor of Samizdata, Perry de Havilland, and was a variation on the name of radical British activist and columnist George Monbiot.

Originally, the term "moonbat" was intended to be more politically neutral, and described wackos on the left and the right, but it quickly acquired its current usage of being applied almost exclusively to those on the left.

The term also references the moon much in the same way that "lunatic" refers to the insanity-causing powers of the full moon (luna = moon). Bloggers occasionally analyze the behavior patterns of various moonbat "species" as if they were actual animals, and even give them satirical Linnaean taxonomical names, such as "moonbattus berkeleyensis".

The entry in the Samizdata glossary indicates that Perry originally coined the full phrase "barking moonbat"; apparently "moonbat" is just a subsequent shortened version of "barking moonbat," rather than being a pre-existing term that was lengthened to barking moonbat.
Worker #1 "Did you see those moonbats on the news staging another one of their useless protests?"

Worker #2 "Yeah, all eight of them."

Worker #1 "Man, they need to get real jobs."
by Garlic M. May 03, 2007
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there nothing in this world more pathetic than an aging hippie dike, moon bat.
by THE KILLA D October 21, 2006
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