assback

1. The back of a donkey.

   1691, uncredited translators, Plutarch’s Morals, Part 2, London: T. Sawbridge et al., p. 224, […] they took her and set her on Ass-back, and led her round about the City,

   1994, Robert Kelly, “In Irish America” in Queen of Terrors, Kingston, NY: McPherson, p. 56, […] tune soft as the assback my Savior rode from Jericho to Caerleon.

правильный