What does the term mean and what is the best way to use it? And, I also wanted to know if there is any information about where it comes from. And by the way, how do we pronounce it?
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It's an onomatopoeic term for an explosion or perhaps something collapsing in an horrendous cascade of messiness.
It use is normally half-joking, certainly informal.
A variant is kablooie as in "Horrendous Space Kablooie", a term used in a comic for the Big Bang that some scientists prefer. Mostly because they have a sense of humour, but also because "Big Bang" was coined to ridicule the theory, not to name it.
kerplewy is ker- + blooey. The OED says: