Mebs is a word you say to someone after they say something that is either lame, not funny, or just plain stupid. You can also Mebs someone if they just look lame or goofy. Also if someone says something in attempt to fish for compliments, you immediately Mebs them.
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.