1736 Canting Dictionary / IJ / JIG [thing]
a Trick; A pleasant Jig, a witty arch Trick.
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Jig in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).