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A coward: a cockpit phrase, all but game cocks being styled dunghills. To die dunghill; to repent, or shew any signs of contrition at the gallows. Moving dunghill; a dirty, filthy man or woman. Dung, an abbreviation of dunghill, also means a journeyman taylor who submits to the law for regulating journeymen taylors’ wages, therefore deemed by the flints a coward. See Flints.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Dunegan * DunnockNathan 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.