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
1 more definition
Top Definition
something that is really really gross and induces a gross feeling
Pooh under your fingernail is focking grossening!
by mark in dallas September 01, 2005

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