A battle has been raging behind the scenes at Wikipedia. No, it's not over copyrights or veracity or how well an article explains its premise. It's over whether or not the entry on San Francisco's Marina District should include an explanation of the term Marina Girl (and, by extension, Marina Guy). The main arguments for deletion is that it's a stereotype and that the content of the article is heavily biased against the Juicy Couture clad set at The Matrix. But if you look at the standing article at the SFGate, it describes to a tee the Marina Girl without actually mentioning the term:

Today the apartment buildings, shops and restaurants seem to be bursting at their seams with beautiful, young and fit 20- and 30-somethings. The singles scene is hopping on Friday and Saturday nights, with lots of fresh-faced postgrads with cocktails in one hand and cell phones in the other. Union is arguably the best street in the city to window-shop the hours away on a sunny Saturday afternoon, and, a few blocks down, Chestnut has an incredible variety of high-quality restaurants catering to every palate.
Of course, the definition can be found over at the Urban Dictionary, as well as at Answers.com (which just scraped the older Wikipedia article). Here at SFist, we don't think Wikipedia will be complete until they've reinstated the Marina Girl and provided a snarky definition for their natural enemy in the wild, the Mission Hipster. It might go something like:
The Mission Hipster is a twenty-something self-proclaimed 'artist,' usually seen drinking Pabst Blue Ribbon at dive bars when not riding up and down Valencia on their track bike. They take pride in their relative poverty (though more than a few have wealthy families), working jobs as baristas or bike messengers. Their signature look includes a fauxhawk (male) or short bowl cut (female), aviator sunglasses, an ironic t-shirt, ripped jeans and Chuck Taylors. They can be found in great number at Slim's or the Bottom of the Hill on any given weekend where they prefer the sounds of acoustic guitars played by troubled singer-songwriters and upbeat post-punk-pop. They often avoid the upper Mission on those same nights, complaining that it's overrun by 'slumming yuppies from the Marina.'
Thanks to Mike for the tip! Photo from The Sweetest Thing.