Green’s Dictionary of Slang

the vagina, spec. of a prostitute.

1616		T. Overbury Characters 164: He will venture as desperately upon the Pox as any roaring boy of them all. For when he arrests a whore, himselfe puts her in common baile at his owne perill [...] upon one of the sheriffes custards hee is not so greedy, nor so sharpe set, as at such a stew-pot.
1654		Mercurius Fumigosus 21 18–25 Oct. 183: The second Dish are Two Whales roasted in a Dutch stow-pot, between a Freesleggs, brought up by two Fisher-men of Barkin.