What is grossening?

The act of shitting in one’s mouth then proceeding to give oral sex with that person’s mouth.

I heard that Chad and Brittany did a grossen last night

grossening - meme gif

A fat guy in a wife-beater with back hair is "grossenating."

Nasty and disgusting. Makes you want to throw up in your mouth a little bit.

Sandy: "I wish that asshat would stop chewing with his mouth open."

Erin: "I know, it's so grossening."

something that is really really gross and induces a gross feeling

Pooh under your fingernail is focking grossening!