A 45/577 calibre rifle used to slaughter natives since 1871.
Made famous at the battle of Rourke's Drift during the Zulu war in 1879.
During which the British Empire slaughtered 1000's of wog's, except at the battle of Isandhlwana, which we won't talk about.
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.