Freudian Split
In keeping with the term 'Freudian slip', the Freudian split is the unintended but sometimes favourable, spoken reference to the opening of a woman's vagina.
Woman A: The banana is a very 'versatile' fruit, it even comes in its own case....
Woman B : Ooh-err, is that a Freudian split?
Woman B : Ooh-err, is that a Freudian split?