bonking
n.— «Ayers testified that on the night of the rowhouse fire, firefighters at the scene complained of an excessive level of blocked calls—or “bonking,” as they call it, for the busy signal the radios make when a call cannot be completed.» —“Council hears of radio glitches at fire” by Jennifer Lin Philadelphia Inquirer (Pa.) Oct. 1, 2004. (source: Double-Tongued Dictionary)