A dunghill about London, on which the soil brought from necessary houses is emptied; or, in more technical terms, where the old gold collected at weddings by the Tom t—d man, is stored.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Lay * LazyNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes