E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Twitcher.
Jemmy Twitcher. A name given to John, Lord Sandwich (17181792), noted for his liaison with Miss Ray, who was shot by the Rev. Captain Hackman out of jealousy. His lordships shambling gait is memorialised in the Heroic Epistle.