A city about 30 miles south of San Francisco on the peninsula which is touted as having the highest percentage of shallow peoples in the San Francisco Bay Area. Most of these folks are neuvo riche, self-entitled, narcissistic, .com transplants from out of state and more often than not, from out of the country.
To be "shallow" for a person means you like them, but only for their appearance or physical attributes. Similar to being "hot" for a person (having sexual interest in a person), except more specific in your reasoning for liking them.
Example A: "David is so obviously shallow for Cindy... he always mumbles about how great her boobs are."
Example B: "I hate to admit it, but I think I'm shallow for Curt after having seen his 6-pack at the pool the other day."