Disposition, principles, humour. Of a strange kidney; of an odd or unaccountable humour. A man of a different kidney; a man of different principles.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Kidnapper * KilkennyNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes