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Osculum infame is the name of a witch’s supposed ritual greeting upon meeting with the Devil. The name means The Shameful Kiss, or The Kiss of Shame since it involved kissing the devils anus, his other mouth. According to folklore, it was this kiss that allowed the Devil to seduce women.

...and seeing that they tarried over long, hee at their coming enjoyed them all to a pennance, which was, that they should kisse his buttockes, in sign of duety to him, which being put over the pulpit bare, every one did as he had enjoyned them.