What exactly is this about? And why is it recommended for mature audiences.

The horrific stuff is reasonably graphic. It probably wouldn't hurt to read the first chapter, get a feel for it.

I knew I wanted to keep reading when I read the word "badgerconda." I'm about two thirds of the way through it. Quite a few times I have laughed out loud, and several times now, I have been out in the world doing things and an image will pop into my mind and I will start laughing again. It's some genuinely funny material IMO.

This person writes some funny stuff. I read that article in the link above ("7 Reasons...etc.") and I was giggling at that too.

Finally finished the book. Pretty entertaining.