The level at which one understands society's, and opposite sex's appeal to oneself. Is able to recognize appropriate times to act immature and can confidently carry themselves through times of despair, relationship issues, job interviews, exams, family problems, etc.
A mature person is mentally free of all immature excuses such as, egocentric blameworthiness, "too tired", "I forgot", or lying for cover. Instead, a mature person will respond to issues with admittance and apologize.
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.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.