you people need some serious help. a Kinder Surprise is a German candy bar shaped like an egg and with a toy inside. yummy chocolate but the toy is tiny as hell and gets lost easy
The act where you a girl would clean her anus in preparation for oral butt sex, and while cleaning her anus, fills it with nutella. When her partner proceeds to eat her ass, they will eat the nutella, making it a kinder surprise.
Cubicle 7 was empty, but there was a queue anyway. Sally wanted to investigate, although Mary told her not to. When she lifted the seat, the toilet was full of shit and she shouted in disgust. Mary laughed and yelled "Kinder surprise!"