Green’s Dictionary of Slang

1. the vagina.

1656		‘Room for a Jovial Tinker’ in Ebsworth Roxburghe Ballads (1893) VII:1 75: The Lady lay down [all her pride] and so did the Tinker too: / Although the Tinker knockt amain, the Lady was not offended, / But before that she [rose up again], her Coldron was well mended.
1661		‘The Tinker’ in Farmer Merry Songs and Ballads (1897) I 144: I am the best man of my Trade, / Quoth he, in all this Town / For any Kettle, Pot or Pan, / Or clouting of a Cauldron.
1724		A. Ramsay Tea-table Misc. (1733) I 96: Sir, ye appear a cunning man; But this fine plot you’ll fail in [...] For I’ve a tinkler under tack That’s us’d to clout my cauldron.

2. (UK Und.) a brothel.

c.1850

Duncombe New and Improved Flash Dict.