The act of defacating in someone's vagina.
Alex went round to Joe's house for some banoffee pie. Turns out, it wasn't what she thought it was.
When a warm banana is inserted into the vagina while the anus is sodomized. The banana skin is concurrently used to flail the buttocks of the recipient.
Leslie: "That banoffee pie you gave me last week was scrumtious"
Andy: "Thank you, you should try my cream pies sometime"