The From Old Books website offers a transcription of Nathaniel Bailey’s Canting Dictionary, a lexicon of British underworld slang published in 1737. Here’s an image of one page spread, and some samples:
BAWDY-HOUSE-BOTTLE, a very small one.I wouldn’t assume that all these terms were current in North America forty years later. Slang is peculiar and quickly changing, after all. But the dictionary does offer a heady whiff of eighteenth-century culture.
EQUIPT, rich; also having new Cloaths. Well equipt, plump in the Pocket, or very full of Money; also very well drest. The Cull equipt me with a Brace of Meggs, The Gentleman furnish'd me with a Couple of Guineas.
HUM-Cap, old, mellow, and very strong Beer.
NICK-Ninny, an emty Fellow, a meer Gods-head.
SHRED, a Taylor.
THUMMIKINS, a Punishment (in Scotland) by hard squeezing or pressing of the Thumbs, to extort Confession, which stretches them prodigiously, and is very painful. In [military] Camps, and on Board of Ships, lighted Matches are clapt between the Fingers to the same Intent.