It's what's left of "real" California on the coast. Not close to either the Bay Area or Los Angeles, still fairly agricultural, still fairly conservative. Geographic boundaries are open to debate, but all agree it's south of Santa Cruz, north of Monterrey. Cities and towns of note would be Morro Bay, Salinas, Lompoc and San Luis Obispo. Very pretty, never got so bizarrely expensive, since it's at least a good two hours to a major airport in either direction.
Thanks much - never heard that term before.
I live on the Central Coast. It has very liberal cities such as Santa Cruz, Carmel, etc. although our state senator is a Republican.