Hello everyone did you need someone in here being a complete pedant? Here I am!
I would spell this slopperator, not sloperator. Putting only one consonant between O and E makes this read "SLOPE-r-ator", like the slope of a hill. Also, there's precedent, if you have a lot of slop, maybe you're sloppy (two p's).
Sloperator sounds like someone who really likes linear regression.