assman

plural assmen

1. Someone who rides a donkey.

   1856, Emmeline Stuart-Wortley, The Sweet South, London: Printed for Private Circulation: Volume 2, Chapter 14, p. 173, We met several camelestrians on our road, and horsemen and assmen; and the scenery in many parts was very pretty.

   2 more examples

   No sooner was Tom upright than the donkey gave the whole of his skin and muscles a wrench sidewise, which felt as if the seat was being dragged away. ¶ The consequence was that Tom nearly went off to the right. He was too good an assman, though […]

   1885, George Manville Fenn, chapter 15, in Dick O’ the Fens, London: Blackie & Son, published 1888, page 244

   Even the asses have a fashionable air, large white beasts loaded with cushions, fringes, and tassels; so that horsemen and assmen trot side by side on equal terms in the gay parade.

   1937, Robert Byron, The Road to Oxiana, London: Macmillan, Part 4, p. 154

2. slangvulgarAn individual male who prefers voluptuous buttocks in a female.