A grease chill is what you get when biting into a highly caloric and greasy food. It also occurs most often after the greasy food settles in your stomach.

When you fuck a ass hole and dump a big load in it and you keep on fucking till it come back out of her or his ass

A grilled cheese sammich that has either been left out all night or refrigerated turning it into chilled grease. Delicious if you have any kind of munchies, not if you don't