shit up
n.— «Assaults, when they happened, were generally of a relatively minor nature in comparison: grabbed arms perhaps, a shoulder-barge, the occasional slap, kick—or a favourite with the subversive prisoner, a “shit up,” (the hurling of the saved-up contents of a toilet bucket over the perceived tormentor).» —“Battered by the system” by Erwin James Guardian (United Kingdom) Sept. 4, 2007. (source: Double-Tongued Dictionary)