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You will ride a horse foaled by an acorn, i.e. the gallows, called also the Wooden and Three-legged Mare. You will be hanged.—See Three-legged Mare.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Accounts * Act of ParliamentNathan 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.