When a man puts feces on the backside of his balls, or scrotum. The man leaves the feces on the back of the scrotum. Once he goes to engage in coitus he rubs the tip of his penis on the back of his scrotum, covering the tip in feces, giving it the appearance of a chocolate egg.
âI heard Brad and Angelina got a divorce because he gave her a Kinder Surprise Eggâ âDude, Chris Gave Chelsea a Kinder Surprise Egg last night!â