In reference to the Florida city of Boca Raton, a Boca bitch is someone (usually female) who has a large collection of Coach bags, is obscenely rich, and usually has bottle-blonde, overly straightened hair, an orange "tan", and walks with the saunter that only someone from the strange city of Boca can have. Is snooty and looks down upon everyone who has less money or is less popular than she. This term is usually used by the rocker, punk, nerd, or other types of people who are stuck in Boca when they see one of these strange airheads.
God, did you see her? She looks like SUCH a Boca bitch!