Mine aunt; a bawd or procuress: a title of eminence for the senior dells, who serve for instructresses, midwives, &c. for the dells. Cant. See Dells.
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.
Athanasian Wench * Avoir du pois LayNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes