1. noun The forced walking of an arrested suspect or alleged criminal through a public space so as to allow them to be photographed or recorded on video. ("Perp" is short for "perpetrator.") The photographers crowded the courtroom steps, eager to get a shot of the billionaire con artist as he began his perp walk.

2. verb To force an arrested suspect to perform such a public walk. Sometimes hyphenated. Police officers perp walked the actor through the crowd after he was arrested for allegedly beating up a reporter.