Sir Monty

A reference to famous British WWII General Montgomery, a man revered for his "military genius", which consisted mostly of futile over-planning.

This word is used primarily as a derogatory term for incompetent decision-makers or leaders, but can also be used to tell anyone how worthless they are.

Tom: I can't figure out how to use the brakes in my car.

Hal: Good job, Sir Monty.