Some use it to signify someone who is always seeking to be the center of attention, and who suck in all those around them with their focus or fanaticism.

I use it as a reference to the folks whose job used to be washing dead folks out of a warplane's plexiglass gun turrets during WWII with a steam hose so that the plane would be ready to fly again. It's a bit grisly, I know and apologize for the word imagery, but such a position was for hardened folks who were the most callous and insensitive.

So when I use the term "psycho hose beast" it refers to folks who are cynical, hardened folks who let nothing stand in their way and won't shed a tear if you get trampled underfoot as they pursue their agenda.