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An arch waggish fellow. In pickle, or in the pickling tub; in a salivation. There are rods in brine, or pickle, for him; a punishment awaits him, or is prepared for him. Pickle herring; the zany or merry andrew of a mountebank. See Jack Pudding.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Picking * Pickt HatchNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.