1736 Canting Dictionary / D / DARK Cully [rogue]
a married Man, who keeps a Mistress, and creeps to her in the Night, for fear of Discovery.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Dark Cully in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).