Jessica Beinecke, 24, films her Web video show in her Capitol Hill living room. "OMG! Meiyu" ("meiyu" means "American English" in Mandarin) has become a huge hit in China, where she has more than 100,000 followers on a social networking site and followers discuss her postings in popular chat rooms. Fluent in Mandarin Chinese, Beinecke translates the slangy parts of American life and culture for