A false identity made up of lies and tall-stories created by people to attract attention and mask their mediocrity.
Emo-kids are a prime example; 9/10 cases, their lives are problem free and they just say their lives are crap to get attention.
"Shit, dude. Mikey's been slitting his wrists again. His dad bullies him constantly."
"Bullpies; his dad's a great guy and devout Christian. Mikey's got a lidentity"
"Pete Wentz attempted suicide, he must have some serious problems."
"Can it, douchebag. He's in a super-successful multi-platinum band and he's dating Ashlee Simpson. His life's way better than mine'll ever be!"
"Sheesh, talk about lidentity."
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.