Eating soup with your mouth open, the sight of it along with vegetables, pouring out your mouth while you're trying to have a conversation at the dinner table.
Pete: *puts soup in mouth* I think that this soup is great *soup pours out mouth*
Steve: That's the most grotesque thing I've ever seen
Something that makes you think of the "goatse man" - an item or image of a hole with hands at either side, being stretched wide open. Coined by "Canis" at Ars Technica
A description of anything with attributes similar or comparable with those of excrement, turds or jobbie-plops.
"As I sat down in the passenger seat I immediately noticed a strong odour which I can best describe as being somewhat gruntesque."
"It's possible that Grand-dad sat down on his sticky date pudding, but the stain on the back of his trousers looked a bit too gruntesque for my liking."