I've only done this twice. The last one was many years ago.
I was sitting on a high metal stool for a while, and I was leaning the stool back on two legs. I felt this pressure build up at the base of my spine, then three LOUD pops. Each pop was about 1 second apart, and each one brought an immediate sense of relief.

I could never get it to pop again after that.

I have always used cracking. But, I see other terms used from different areas of the world.

For example is clicking more commonly used in the UK?
And, is cracking more commonly used in the US?
Or is it just based on personal preference.