1. A pony with an extremely bad attitude to things (everything, everyone.) Also the word "Darkhearted" can be used when describing other animals (e.g Darkheartedduck)
2. a very awesome person who saw an Albanian guy kick a puppy twice.
Angelina Jolie rode to Hollywood on a Darkheartedpony on dismounting she tried to feel the Pony a carrot to which it responded to biting her fingers and face off. Then galloped away on a carpet of live Darkheartedrabbits.
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.