A pocket book. A dummee hunter. A pick-pocket, who lurks about to steal pocket books out of gentlemen’s pockets. Frisk the dummee of the screens; take all the bank notes out of the pocket book, ding the dummee, and bolt, they sing out beef. Throw away the pocket book, and run off, as they call out “stop thief.”
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Dumb Watch * DumplinNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes