To do something reckless or nonsensical without any regard for consequences or common sense. Often associated with a quirky or offbeat personality, an obsession with Taylor Swift, a dislike of Corgis, and/or being from Iowa. Can also refer to starting a fire for fun or excitement, despite the risks involved.
"I can't believe you just jumped off that roof into the pool! You're totally pulling a Sadie right now."
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.