As mentioned in the film "Banana Split" directed by Kip Fulbeck, this is an abbreviation for "Fashion-Conscious Oriental." It is used pejoratively to refer to an Asian who feels compelled to show how wealthy he/she is by purchasing and exhibiting large quantities of expensive brand-name clothing and consumer electronics.
I would not be surprised to see this listed as a target demographic in the annual reports of companies like Nokia, Banana Republic, and Armani.
For more on this topic, read the various rantings of DMan.