Moonbat (also "barking moonbat" and "moonbat crazy") is a term often used currently in U.S. politics as a political epithet referring to anyone that is believed to be liberal or on the left. An extreme leftist, throwing aside logic for political convenience. "These people wear winter clothes in the summer". Characterized by men in ponytails, sandals with socks, and Bush's Last Day bumperstickers. Often seen at global warming marches that take place during snowstorms.