May seem cool to use till the dimmer members of society ask you what you could possibly mean by it, and wouldn't you be better off using 'sarcasm' in any case.
Often used as part of the phrase 'Ironie und Sarkasmus', particularly when specifying languages on Facebook profiles. Literally the phrase means 'Irony and Sarcasm'.
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.