When someone has to shit really bad (or has diarrhea) but also intends to do a summersalt and in the act of doing the summersalt they shit themselves (sometimes leaving a trail of shit).
Tanner wasn't feeling well yesterday and he went to do a summersalt but when he did it. he accidently shit himself creating a shittersalt.
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.