A cart; also a sharper employed to draw in pigeons to game; likewise a posture-master, or rope-dancer. To shove the tumbler, or perhaps tumbril; to-be whipt at the cart’s tail.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Tuft Hunter * To TuneNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes