Originally Posted by CommuterRun
In the broadest sense, it's someone who drives a vehicle, such as a car, SUV or light truck, etc., that completely surrounds them with metal, glass, plastic, etc., as if they were in a cage.
I first heard the term used in certain motorcycle circles over 30 years ago.
Generally it's used to describe certain drivers who behave like idiots behind the wheel.
I sometimes use the term as a faux surname to describe certain drivers, often Moron Cager.
The highest Epithet a motorcyclist/cyclist can use is CLUELESS CAGER. There I was on the corner in a small town, and a guy in one of those $95,000 pick-it-up trucks, cuts off a biker on a Harley, leather pants, leather vest, beard, skin decorations, the whole nine yards, and what to my ears do I hear CLUELESS %$#@!%$ CAGER, from the biker.....