As I often do when I've got an idea on the go, and especially when I'm giving it a title, I'll look up the word/words/phrase in Urban Dictionary to see if there are other, earthier, meanings or definitions accredited to, usually, an innocent/harmless phrase such as, in this case, Slippery Slope. (It's good to cover all bases.)
Ironically, when looking up the definition in the aforementioned alternative online dictionary, my search turned into a slippery slope all of its own. Yes, the first two were as you'd expect, but 3, 4, 6 & 7 were, ahem, new to me.
Whilst we're on the subject of slippery slopes, give this a coat of looking at: it's the new Japanese game show that's sweeping, well, Japan. It's hilarious.