Green’s Dictionary of Slang

knothole n.

1. (US black) a doughnut.

[US] ‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.

2. (Aus.) the vagina.

[Aus]J. Hibberd Dimboola (2000) 81: dangles: [to shirl] How’s your knot-hole? shirl: Funn-nee! Not for you mate.