Disposition, principles, humour. Of a strange kidney; of an odd or unaccountable humour. A man of a different kidney; a man of different principles.

–From the 1811 Dictionary of the Vulgar Tongue.

1811 Vulgar Tongue

To coax or wheedle. To inveigle. To amuse a man or divert his attention while another robs him. The sneaksman kidded the cove of the ken, while his pall frisked the panney; the thief amused the master of the house, while his companion robbed the house.

1811 Vulgar Tongue

A little dapper fellow. A child. The blowen has napped the kid. The girl is with child.

The word kid is not anachronistic to the time period.

1811 Vulgar Tongue

Breeches. A high kick; the top of the fashion. It is all the kick; it is the present mode. Tip us your kicks, we’ll have them as well as your lour; pull off your breeches, for we must have them as well as your money. A kick; sixpence. Two and a kick; half-a-crown. A kick in the guts; a dram of gin, or any other spirituous liquor. A kick up; a disturbance, also a hop or dance. An odd kick in one’s gallop; a strange whim or peculiarity.