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A ninny, or fool. John-a-Nokes and Tom-a-Stiles; two honest peaceable gentlemen, repeatedly set together by the ears by lawyers of different denominations: two fictitious names formerly used in law proceedings, but now very seldom, having for several years past been supplanted by two other honest peaceable gentlemen, namely, John Doe and Richard Roe.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Noisy Dog Racket * NollNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.