The King’s Bench Prison. Lord Ellenborough’s teeth; the chevaux de frize round the top of the wall of that prison.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Elbow Shaker * ElfNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes