The Collaborative International Dictionary of English v.0.48:
donkeywork \donkeywork\ n. hard menial routine work. Syn: drudgery, grind, scut work. [WordNet 1.5]WordNet (r) 3.0 (2006):
donkeywork n 1: hard monotonous routine work [syn: drudgery, plodding, grind, donkeywork]