Another name for a cell phone without a headset used by a driver while driving. Causes the driver's blind spot to go from a minimal 15 degrees over either shoulder to a stunning 180 degrees on their right (or left) side, as they forget to check their mirrors before doing something stupid like cutting you off.

A good wingman is the best defense against drivers employing blind spot enhancers. Most traffic cops will accept this as a patent reason for getting caught in a speed trap in moderate traffic.

Got the covid-19 vaccine