The west side is NOT, as incorrectly defined, the west coast. It refers to the westside, duh, of a major city. It is used by street gangs if they originate from the western neighborhoods of a certain area. If you live on the west coast, that does not make you west side. That depends on where in that particular city you reside.
Rob: You're from San Francisco, right?
Rob: How are things on the west side?
Bobby: Uh...you mean, west coast?