One that is security for goods taken up on credit by extravagant young gentlemen. Cunny warren; a girl’s boarding-school, also a bawdy-house.
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.
Warming-pan * WashNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes