Similar to tomfoolery, except to a greater extent, and often involving mindfucking and very indecent behaviour.
An extremely well endowed leprechaun who hangs out in a men's bathroom, convincing men that he would grant them wishes if they allow him to fuck them in the ass, then asking how old they are, and then stating, "So you still believe in leprechauns..." is a blatant display of tomfuckery.
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.