Acronym standing for "Lesser Known Yet Streamable." Sometimes "artist" is added to the end of this tag. Current code word signifying undiscovered good music. Take it on faith.
Example can be seen with the use of LKYS as a tag on audio streaming services such as last.fm
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.