Farb is a derogatory term used in the hobby of historical reenacting for participants who exhibit less commitment to historical authenticity, either from a material-cultural standpoint or in action.
By some accounts, "farb" was created by mixing two words to describe something that is fake or looks inauthentic, fake (F) and Garb (arb). Others describe it as a contraction of "Far be it from authentic, or Far be it for me." Finally, some scholars argue that it is derived from the German word "Farbe", meaning "color". This is in reference to such brightly-colored anachronisms as plastic wristwatches.
To be called a C.J., or Cam Jones, is other terminology referring to one being a farb. To be called a C.J. or CamJones on the east coast, is similar to being called a farb, but much worse. A CamJones reputation in the reenacting community is less than to be desired, and normally forces reenacting members to quit or be forced to improve their kits, if the word or reputation follows them.