The behaviour or attitudes of moonbats; left-wing lunacy.(noun)
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Use "moonbattery" in a sentence
"Wow - the level here of Paul R. Ehrlich-esque moonbattery is almost stunning."
"Scot Lehigh has exonerated Ned Lamont from the charge of "moonbattery"."
"They are both partisan media personalities and if they are going to trot out Moore as being the personification of left wing "moonbattery", it's a great opportunity to draw a comparison to the wild-eyed wingnuts of the right and perhaps bring them back into the realm of crazy aunts in the attic."