HOG,
a Shilling; You Darkman Budge, will you Fence your Hog at the next Boozing Ken? you House-Creeper, will you spend your Shilling at the next Ale-house.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Hog in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).