What is your definition of slow roll?
I think we all sort of know what it is even if everyone defines it slightly differently. I'd probably define it as something like:
"Deliberately slowing the natural pace of the game on a decision which is inconsequential and usually (but not necessarily) with your hand being the perceived best hand."
The classic example is facing an All-In bet on the River and you hold the stone nuts, but take forever to reveal it. This is poor sportsmanship and a slowroll because you are last to act and you already know your decision to call with the absolute nuts. There is nothing objective to the game gained by wasting everyone else's time here.
This would be different if other(s) were left to act after your decision when a bit of "Hollywooding" might convince others to get involved and build the pot further for you. Most good players see through this obvious act, but at least there is some merit to this. It is strategy of the game, whereas slowrolling doesn't change the outcome.