Green’s Dictionary of Slang

the vagina.

1675		C. Cotton Scoffer Scoff’d (1765) 264: She has a Dimple, / And such a one, as who would not / Put all his Flesh into the Pot?
1719		in D’Urfey Pills to Purge Melancholy IV 66: Her Eyes like Stars do so twinkle, / Her Face is smooth, without wrinkle, / Her Chin’s adorn’d with a Dimple, / Like the Charms above her Knee.
1842		‘Toasts And Sentiments’ in Nobby Songster 48: A toast to the charmer whose dimple we prize.
1890–1904		Farmer & Henley Sl. and Its Analogues.