1736 Canting Dictionary / P / PIG [money]
Six-pence. The Cull tipt me a Pig, The Man gave me Six pence.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Pig in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).