On October 20th 2010. You expected to wear purple this day to support gay rights and anti-homophobia. It is supposed to honor the six homosexual men who have killed themselves do to homophobic behavior from their peers. I am pretty sure it was created on Facebook, but I'm not positive.
"Hey, are you wearingpurple on Wear Purple Day? It's on the 20th."
On January 15th people cover their faces with purple freckles using a purple marker. It's a day to think about the mistakes of others and to deal with stress.
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.