E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Beggars, Leland calls it a gipsy word. In Norwich, Christmas waits used to be called Mumpers. In Lincolnshire, Boxing-day is called Mumping-day (q.v.). To mump is to beg. Beggars are called the Mumping Society.
A parcel of wretches hopping about by the assistance of their crutches, like so many Lincolns Inn Fields mumpers, drawing into a body to attack [infest or beset] the coach of some charitable lord.Ned Ward: The London Spy, part v.