The dried gut of a sheep, worn by men in the act of coition, to prevent venereal infection; said to have been invented by one colonel Cundum. These machines were long prepared and sold by a matron of the name of Philips, at the Green Canister, in Half-moon-street, in the Strand. That good lady having acquired a fortune, retired from business; but learning that the town was not well served by her successors, she, out of a patriotic zeal for the public welfare, returned to her occupation; of which she gave notice by divers hand-bills, in circulation in the year 1776. Also a false scabbard over a sword, and the oil-skin case for holding the colours of a regiment.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Culp * CunninghamNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes