Something that is so outrageous and random that it almost seems as made up as this word
Joe: Hey did you know that trees are just giant hairy mushrooms?
Harry: What? No, you're being flasical
Joe: What?
Harry: That fact was more outrageous then that word I just made up
of rubbery or bouncy texture or constitution (such as the fat on a cut of meat, or of the cleaning product Swarfega which although liquified vibrates when the tub is tapped).
(1) I'll leave that piece of steak, thanks, it looks a bit too flibsiclistic for my liking.
(2) The being emerged from the ship, and appeared to be covered in a translucent reddish-green slime, which was sliding down it's back where it formed flibsiclistic splibuoles.
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.