Unknown outside the dork-infested waters of the Blogosphere, her name is Jessica Coen, and she’s the co-editor of Gawker.com, where she regurgitates newspaper and magazine stories and slathers them in supposedly witty sarcasm. Every time we bump into Coen, 25, who likes to accessorize with a stuffed dog poking out of her handbag, she smiles and showers us with sycophantic praise. But her every mention of PAGE SIX on her Web site is snide and snarky. Word to Coen: Next time you see us at a party, keep walking. Or slithering. You can’t be a boot-licker and a back-stabber at the same time.