A country put; an ignorant awkward clown. To put upon any one; to attempt to impose on him, or to make him the but of the company.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Pushing School * Puzzle-causeNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes