cell warrior
n.— «Among prison guards, Tavares became known as a loud-mouthed malcontent who spat at guards passing his cell, tossed feces or urine at them, and made violent threats. “He was what guys refer to as a cell warrior,” said an officer who once worked at MCI-Cedar Junction and spoke on the condition of anonymity. “He was always making trouble from his cell.”» —“The state could have stopped him” by Shelley Murphy, Jonathan Saltzman, Scott Allen Boston Globe (Massachusetts) Dec. 18, 2007. (source: Double-Tongued Dictionary)