An insult formed by removing the word "jack" from jackass and replacing it with the word "jerk." Basically describes a person who is being a real jerk. Used when you need to get the point across that a person is a jerk where just the word jerk won't cut it.
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.