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The devil. CANT.—May the ruffian nab the cuffin queer, and let the harmanbeck trine with his kinchins about his colquarren; may the Devil take the justice, and let the constable be hanged with his children about his neck. The ruffian cly thee; the Devil take thee. Ruffian cook ruffian, who scalded the Devil in his feathers; a saying of a bad cook. Ruffian sometimes also means, a justice.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Ruff * RufflesNathan 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.