To exchange backwards and forwards. To chop, in the canting sense, means making dispatch, or hurrying over any business: ex. The autem bawler will soon quit the hums, for he chops up the whiners; the parson will soon quit the pulpit, for he hurries over the prayers. See Autem Bawler, HUMS, and WHINERS.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Chop * Chop ChurchesNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes