A joke upon the Dutch women, supposing that, by their constant use of stoves, which they place under their petticoats, they breed a kind of small animal in their bodies, called a sooterkin, of the size of a mouse, which when mature slips out.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Song * SopNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes