Choak away, the churchyard’s near; a jocular saying to a person taken with a violent fit of coughing, or who has swallowed any thing, as it is called the wrong way; Choak, chicken, more are hatching: a like consolation.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Chiving Lay * Choak PearNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes