Dictionary.com tells me that there is no such word as angery. The writer (of "Angry Justin Bieber fans vandalize Esperanza Spalding’s Wikipedia page" on Yahoo! Canada News on February 14, 2011) was probably trying for angry. After telling me there are no results for angery, Dictionary.com asked, Did you mean onegry? I clicked on onegry and found out it's a noun with the following definition: a state of being alone and unhappy. It does seem to fit, so perhaps the writer meant to write onegry and not angry.