Originally Posted by N_C
Cager - they are a step down from motorist. They typically only acy like *******s around cyclists but are safe around other motorists. They do stupid **** while driving on purpose but they are no where near as bad as a JAM.
Maybe that's how you use the term, but it originated with motorcyclists who use it to refer to anyone driving a car or truck. It's not necessarily derogatory.
Originally Posted by Wikipedia
Cager is also used by motorcyclists and bicyclists to describe a person who drives a car. Similarly, cars themselves are described as "cages". The term is derived from the common feeling among motorcyclists that driving or riding in a car feels like being trapped in a cage, as well as alluding to the safety cages in modern cars, and to a certain extent the locked-in mindset of "cagers" who refuse to acknowledge the practicality of other modes of transport.
http://en.wikipedia.org/wiki/Cager
Also, a motorcyclist can never be a cager, by definition.
A motorcyclist might be a JAM.