Used as a verb: To take something previously in great condition and completely screw it up upon arrival. Most commonly used in terms of the sport of college football in regards to taking over a good team, and be a very poor coach, and after losing to vastly inferior opponents.
Also used as a verb in terms of sports to denote incompetence.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.