when you are ready to shit in a public bathroom, yetsomebody comes in, and you hold it so that they won't hear embarassing noises coming from you (in essence, you are "sitting still"), and THEN you shit once they leave.
Roger: Hey, Dave! You don't look so good.
Dave: Man, someboy came in when I REALLY had to crap, and I had to have a shitstill until they left. It REALLY hurt to have to hold it for so long!
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.