A Cadbury cream egg is when you sh*t on someone's body, then ejaculate in the sh*t and make the one you sh*ted on eat it.

Is brown and creamy, just like a Cadbury cream egg

Used to describe (generally female) imagery that's suggestive, but in a PG-13 sense rather than an R or above sense.

When a woman is shocked, she leaves a beautiful Easter present consisting of feces, urine, and estrogen. All three combined make a Cadbury Cream Egg.