My kinks:

Diarrhea and messing (solid scat just turns me off)
(Particularly people messing in frilly/expensive clothing, kimonos etc, swimsuits, or athletic wear or military uniforms)
Vomiting
Diarrhea/messing and vomiting at the same time (surprisingly hard to find)
Severe stomach pain (not punching/ryona though)
Desperation
Omo
Parasites (not the kind that's basically possession though)
Dickworms (think CoC)
Contagious illness
Mass illness
STDs
Spiking/contaminating foods/beverages/objects with pathogens, laxatives, etc
Piss/cum enemas
Being tied down and ridden by force/"reverse rape"
Forced orgasms
People with dicks cumming in their pants
(really any kind of uncontrollable orgasm, but it's more spectacular and messy with jizz)
People trying to behave normally in public (and failing) while super horny or desperate
Shibari (more aesthetic than anything else)
Leather
Sounding
Fisting (other people--don't know if I could actually take anything that big myself)
AWT
Monsters
Bonus points for male characters doing any of these things, since there's usually less of that

Basically any loss of body control as an orgasm metaphor, so long as it doesn't turn into straight-up bimboification (like, no vegetables, and no amputees-who-are-obviously-fetish-amputees). And mostly not in real life; except for the leather, shibari, sounding, fisting, and forced orgasm stuff (and maybe a little omo), I get really grossed out by even live action porn. (It's also usually in a language I don't know, so I don't know if the actors wanted to do it or are okay, which is something I care about when it's real people.) Which, since it would be kind of unsanitary and illegal in real life to do half the things I fantasize about doing, not to mention impossible with a lot of them, is probably for the best. Also, absolutely no eating or intentionally smearing shit. Can't stand that, even in fiction.