Leck mich am Arsch https://en.wikipedia.org/wiki/Swabian_salutePerhaps the idea which is expressed in the literal meaning goes back to ancient magic conceptions that turning the bare bottom towards a danger or unwanted person (a demon, a witch, a curse) will work as a protection spell. Also, a reference to the feudal homage kiss could be recognized. Stone depictions of this act can be found on gates and walls of medieval buildings such as castles, town fortifications, monasteries and even churches in south Germany (not limited to Swabia), Austria, eastern France and some other places in Spain and Italy.
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