The most disgusting, depraved and sickening fetish I have come across online over the past thirteen years is "failed workouts". It's a fetish wherein people exercise while eating fast food down their neck, drinking fizzy drinks, et cetera. Puts a knot in my stomach like nothing else, it's fucking nasty. Sometimes it isn't even a fat chick or anything, just the act in of itself. Yuck. I've seen some wicked foul shit, but that's the worst by a landslide despite it being fairly tame. Only noting this as I was briefly meditating on how autisticly thorough my filters have became on various boorus due to degenerate filth.