Green’s Dictionary of Slang

the vagina.

1734

C. Johnson Hist. of Highwaymen &c. 114: I vow, Madam, I would give the Five Hundred Pounds [...] which now lies in my Escritoire, provided I could have your Tow-wow mov’d but one Inch higher. [Ibid.] 115: Isaac told her he would give her a Guinea if she would lie down [...] and let him put his Finger into her Tow-wow.