A kid who grew up in La Jolla California. Usually spent their days going to windansea and carving their name deep into the rocks. Probably threw bonfires, jumped off pinkwall (a cliff) after smoking js with other locals, and spent their weekends kicking it with homies from highschool. Often got along with most of the residents (The ones that weren't snobby). Much different from the La Jolla kids who do their best to act cool, a La Jolla rat is someone who doesn't care what others think about them.
"Those damn La Jolla rats party at pinkwall and leave beer cans everywhere!"
"Did you just say 1210? What are you some kind of La Jolla rat?"