assmanship

1843, Thomas Wilson, The Pitman’s Pay and Other Poems, Gateshead: William Douglas, Notes, p. 96, He had put the assmanship of many to the test, but none were able to sit him, whenever he had arrived at a suitable place for depositing his load […]

1906, E. V. Lucas, “Scourhill’s Adventures” in Forgotten Tales of Long Ago, London: Wells-Gardner-Darton, 1907, p. 163, […] Master Scourhill would find himself much fatigued after his brilliant display of assmanship, which so much astonished the village.