The act of throwing assorted items, including but not limited to; watermelons, soda cans, eggnog, potatoes, 3 liters of pineapple soda, gallon milk jugs, spike shooters, and cans that have flown back in the window from previous grundle bombing. If there are two italians, one polack, and a fat german you are the ultimate grundle bombing team. yaaaaaaa moooonnnnnnnnn.

Literally everyone, ever. Including the writer of this definition.