A San Francisco-Bay Area term referring to members of the female gender living in an inflated state of mind leading them to believe they are way hotter than are in reality. More simply put, a girl who is a 4 and acts like a bitchy 9.
Dude, I am so frustrated, I need to get out of the San Francisco swamp, all the girls here are under the 49er effect.
by tommtomm March 29, 2013