laid an egg
Commonly used in hockey. When a team plays poorly and/or below expectations. Also "lay an egg" or "laying an egg".
Example:
Person 1: Did you see that Leafs game last night?
Person 2: Yeah. They really laid an egg.
Person 1: That's putting it lightly.
Person 1: Did you see that Leafs game last night?
Person 2: Yeah. They really laid an egg.
Person 1: That's putting it lightly.