JORDAIN,
a great Blow or Staff; also a Chamber-Pot. I'll tip him a Jordain, if I transnear; I will give him a Blow with my Staff, if I get up to him.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Jordain in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).