The San Francisco Bay Area; a diverse and largely liberal area spanning the Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma counties. Includes San Francisco, Berkeley, San Jose, and Oakland. Also referred to as "The Yay" or "The Yay Area," in some slang.
"Where in the Bay are you from?"
"I'm from Berkeley, man."
"Oh, a hippie!"