When a person tells another person to do a thing that clearly cannot be done. Often used when a person has fucked up, but is too proud to admit it, and instead places the blame on someone else.
Employee: "But, you told me to do it..."
Boss: "Yes, well if I told you to fuck a spider on the moon, would you do it?"
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.