moonbat in English dictionary moonbat Meanings and definitions of "moonbat" (pejorative, Internet) Used by the right-wing blogosphere to refer to their ideological opponents. noun (pejorative) A liberal (someone with a left-wing ideology). more Grammar and declension of moonbat moonbat ( plural moonbats) moonbat (plural moonbats) more Sample sentences with "moonbat" Declension Stem Try again Authors