CLICKET,
Copulation of Foxes, and thence used in a Canting Sense, for that of Men and Women; as The Cull and the Mort are at Clicket in the Dyke.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Clicket in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).