Moonbattery vs. Moonbat — What's the Difference?

The behaviour or attitudes of moonbats; left-wing lunacy.

"Moonbat" is a pejorative political epithet used in United States politics, referring to liberals, progressives, or leftists (especially the far-left), a possible parallel to the pejorative "Wingnut" attributed to American conservatives, and right-wing politics.

A liberal someone with a left-wing ideology.