anilingus

Allegedly coined by sexologist Richard von Krafft-Ebing who had already used cunnilingus in such a sense of denoting the practice instead of its actor and spread by the tenth edition of Psychopathia sexualis of 1898 (English edition page 185, German edition page 124, referencing a description of his in Centralblatt für die Krankheiten der Harn- und Sexual-Organe Vol. VI of 1895 pages 355–357). However that usage of this word is just one incidental one and such an attribution may be transferred from the observation of other sexological terms having spread by Krafft-Ebing’s book. Likely independently coined at various occasions by analogy to more frequently known cunnilingus, that is a translingual blend of anus + cunnilingus.