Sometimes when you see your opponents getting out a ramp and a barrel of lube, you can call it a slippery slope.

It's a fallacy when there is no cause and effect for each step. This, however states the steps.

Slippery slope actually works though.

Makes no sense to treat it like some unwelcome argument

Only if it was not something they constantly already do.

In a philosophy classroom, it’s a fallacy. In a courtroom, it’s called precedent.

it is the thin edge of a slippery wedge..

slippery slope is if you say 'if a therefore d' not 'a leads to b leads to c leads to d'

"Slippery slope" is a term like "conspiracy theory". Tarnished by overuse, often misapplied, but they absolutely exist.

I would rather call it the boiling frog. But hey, whatever floats your boat.