The story
Unclear. Unconvincing claims have been made of the term's origin in Aesop's Fables (The Goose That Laid the Golden Eggs) and in Swedish history. Attested as cook someone's goose from 1845.
Etymology from Wiktionary, CC BY-SA 4.0.
someone's goose is cooked
Today it means: All hope is gone; there is no possibility of success; the period of good fortune is over. Full definition →