A figure of non-Euclidean geometry with more than four faces which intersect at right angles.
On a globe the following route (travelling always on great circles) describes a juanagon: begin at the North pole, travel to the equator, travel 90 degrees due West, travel to the South pole, turn right (counter clockwise) 90 degrees, travel to the equator, travel due West 90 degrees and then travel to the North Pole.
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.