1. Lynn knew that she was going to be in trouble for coming home late again. She wouldn’t be able to talk her way out of it this time; her goose was cooked.
2. The students had sneaked into the classroom to see if they could find a copy of the exam, but now they could hear the teacher coming down the hall toward the room. Their goose was cooked.

The expression is used when someone is about to be punished.