Leaky Vagina

A leaky fanny is a female's intimate area after forms of sex or masturbation. This means her vagina could be leaking because of the male semen inside of it, or the female experiencing an orgasm.

The term "fanny" is slang for a vagina.

Oh, I took it out and she had a proper leaky vagina.
She orgasmed so hard, that her fanny leaked everywhere.