Wiktionary
vagina dentata
n. The myth of the toothed vagina; often related to castration anxiety.
Wikipedia
Vagina dentata
Vagina dentata ( Latin for toothed vagina) describes a folk tale in which a woman's vagina is said to contain teeth, with the associated implication that sexual intercourse might result in injury, emasculation, or castration for the man involved. The topic of "vagina dentata" may also cover a rare medical condition affecting the vagina, in which case it is more accurately termed a vaginal dermoid cyst.
Usage examples of "vagina dentata".
Then back to it, vagina dentata, so absurd those frightened patriarchal myths, teeth were entirely superfluous, did a python need teeth, did a rock stamp need teeth?
The Heath around her, and two men dead by a vagina dentata: she nearly laughed out loud.