In reply to:

I may be waaaaay off base here, but might there be a connection with the French word "toit," meaning "roof?" The vulva does somewhat resemble a roof, having two halves that peak at the center, and the pronunciation is similar except for having no "t" at the end.

This extrapolation sounds reasonable Geoff but would only be applicable if we used, or ever used, the word toit to describe the vulva; which we do not. I will not write the names used as most are quite crude but none really resemble toit or twat.

I checked my Larousse, Petit Robert and Dictionnaire de la langue française just in case. They do not have that definition either.


Oh well, good try though.