1736 Canting Dictionary / K / KEEPING Cully [person]
one that maintains a Mistress, and parts with his Money very generously to her.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Keeping Cully in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).