It’s a celebration word. A world that describes complete happiness. Like when you do something they say can’t be done, or when you skydive, or when you have your first kid. Extreme high light of your life!
This word first appeared several decades ago, in the brilliant comedy film Monty Python's Quest For The Holy Grail, from the Monty Python team. It is said by the leader of the...knights-who-all-too-recently-said-ni when he tells Arthur they're no lnoger the knights who say ni.
I froget the exact word, but he says "we now the knights who say <something>woopetang<some more nonsesne, trailing off into just a nosie>"
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.