anal sex 鸡奸 Word OriginMiddle English (in the sense ‘heresy’): from Middle Dutch buggerie, from Old French bougrerie, from bougre ‘heretic’, from medieval Latin Bulgarus ‘Bulgarian’, particularly one belonging to the Orthodox Church and therefore regarded as a heretic by the Roman Church. The sense ‘sodomy’ (16th cent.) arose from an association of heresy with forbidden sexual practices; its use as a general insult dates from the early 18th cent.