1. (MAD) Any situation or course of action which ensures the total erradication of all parties involved.
2. Often used to describe what would have happened in the Cold War Era were one side to have attacked the other using nuclear weapons, causing the other side to retaliate, ensuring the nuclear obliteration of most of Asia and North America.
1. When Phil and Bob entered into that gay-suicide-love-pact, they were pursuing a course of mutually assured destruction.
2. Mutually assured destruction never happened in the Cold War -- look around you people; we're living in America, not the movie Cyborg.