Nickname for musician and Beatle Paul McCartney whenever he grew out a beard. Most usually referring to McCartney's look from roughly 1968 to 1971, when he had a full beard for most of the time, except for a few months in 1969 when he shaved it off. Paul notably sports the "McBeardy" look during the Beatles' famous 1969 Rooftop Concert.
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.