The more intense version of the sun patch. When the ass recieves a blow so hard that it becomes bruised for several weeks. The purple color gives it the name "Jelly Stain".
Usually seen among s&m and bondage lovers.
"That Jelly Stain looks like Rosie O'Donnell's fat ass, man."
Chris: "Dude, did you know that Rosie O'Donnell is notorious for her sun patches and jelly stains?"
Kevin: "Yeah, on the news yesterday it said she gave Ellen DeGeneres a fat ass jelly stain on the set of THE VIEW."