assback adverb 1noun 1forms 1 adverb1 •On the back of a donkey.[…] I should have thought a great chief had something better to do than to play chess either horseback or assback. — 1850 noun1 •The back of a donkey.[…] they took her and set her on Ass-back, and led her round about the City, — 1691 formsassbacks
