At the end of season 1 in the basement Lucas sings a tune about how Dustin farted

They also have a spitting contest off the cliff

S1E7 and S1E9

Someone spits on the feet of the couple in the opening, and several monsters throughout the film (especially Pennywise) drool excessively

Steven has healing spit, and there is multiple scenes where he licks his hand then wipes it on someone, usually an injured person.

Jake spits out food after being disgusted by another character's foot.

Someone spits to indicate disgust.

Blood is spit out of his mouth as well as the main character does drool a couple times.

One of Miu's character sprites shows her spitting as she laughs.

There's a pretty nasty "phlegm globber" situation.

Bad Janet farts a LOT.

The lighthouse keeper, played by Willem Dafoe, farts a few times in the movie. The first time is even before you first see him. How is that for an entrance?

There is a character frequently shown drooling

It's not all highbrow, folks

In a humorous scene near the beginning of the film, Jack teaches Rose to "spit like a man."

I mean....... probably at one point

There is a running gag in one episode of an actor that won't stop spitting on Joey during his scenes.

One episode focuses on a patient who can't stop farting because of a medical condition.

Iggy has a habit of chewing on people's hair and farting in their faces.

A "cat" has a "hairball" and spit/saliva is seen

An adult spits on a child in order to save said child.

At the mental institution Jules is sent to, an aggressively and sexual teen spits at a glass door.

Llamas spit, and pandas produce snot balls when sneezing.

Red spits in piscatellas face