Derived from interweb message board users, originally as a typing error. "teh" essentially means "The" and "teh cool" Means "The B0mb," "The Shit." An acronym would be "teh suck"
Guy 1: Hey man, did you see the new sword I got for my FABLEcharacter Zweganorax?
Guy 2: Yeah it's teh cool!
Guy 3: Your sword is teh suck!
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.