A woman’s tongue; also a device to take birds of that name by imitating their call. Quail pipe boots; boots resembling a quail pipe, from the number of plaits; they were much worn in the reign of Charles II.
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.
Quag * QuakersNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes