something that is really really gross and induces a gross feeling
Pooh under your fingernail is focking grossening!
by mark in dallas September 2, 2005
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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."
by Sandy Lemke February 29, 2008
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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
by ThatTransGirl February 12, 2018
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