49er Girl Share definition Flag A female that resides in San Francisco who thinks she is a 9 when she is really a 4. Dude, why are you trippin about that 49er Girl? She is straight fugly! 49er Girl by SparklinUnicorn October 30, 2010 0 0 Get merch Get the 49er Girl mug. Buy Now — $32.95 See more merch