What jargon are you saying doesn't "mean something"?
Well, for starters, your "Agile" business. Agile is a already a word that means something. Since this process is clearly taking awhile, it is, well, not agile. Some suit must have come up with this term because it sounds word-like and therefore cool, but it is nothing more than newspeak. War is peace, freedom is slavery, and agile is slow.
That's how all jargons work - you don't go inventing new words, you don't start speaking Elf. You just have a bunch of people agree that something means something else now, then spread it around. If the jargon group is large enough, eventually the word meaning will shift in the mainstream language as well, like, say,
mouse.
It's a natural feeling to be opposed to such things, but they have their use. Sure, you could say "human interface manipulator device" or "that thing that makes pointer move on the screen that you hold with your hand that's sticking out of the computer", or you can say "mouse". Same shit with the business lingo terms - they usually house a large concept in a brief word or word cluster and speed up communication between a pair of zombified execs. It's all Practical Evil.