Green’s Dictionary of Slang

the vagina.

1538		J. Bale Comedye Concernyng Three Lawes (1550) Bii: Your mouth shall kysse my docke Your tongue shall it unlocke.
1611		L. Barry Ram-Alley III i: A fico for her Docke, youle not be ruld.
1621		Rowley, Dekker & Ford Witch of Edmonton III i: Katherine’s Dock, my sweet Katherine’s Dock.
1654		T. Killigrew Thomaso Pt II I ii: Then wear out my dayes dully in some Widows dock at home.
1656		Mennis & Smith ‘Description of three Beauties’ Musarum Deliciae (1817) 34: Mopsa with her puddle Dock, / Her Compound or Electuary, / Made of old Ling, or Caviary.
c.1660		C. Cotton Valiant Knight Act II: [I] would steer my Main-yard Into the Dock of some she Spanyard.
1693		Gould Corruption of the Times 30: [He] Exhausts his Strength to please the insatiate Itch Of a bold, strong Dock’d, fleshly, brinded Bitch.
c.1707		‘The Scotch Wedding’ in Farmer Merry Songs and Ballads (1897) II 138: Jenny made a Curtshy low, / Until the Stairs did touch her Dock.
1787		Burns ‘Sing, Up Wi’t, Aily’ Merry Muses of Caledonia (1965) 83: Deil ram their lugs, quo’ Willie, / But I hae scour’d her dock!