Silly Goose Share definition Flag Silly goose is often used when someone is being silly or crazy (not in a bad way). "Did you forget to ask your teacher about the exam again, you silly goose?" or " Haha, cutie pie, you are such a silly goose" Silly Goose by Existingname October 4, 2017 0 0 Get merch Get the Silly Goose mug. Buy Now — $32.95 See more merch