This article advances the “doing gender” framework by highlighting some unique interactive challenges that nonbinary individuals encounter within the binary gender system. In order to access testimony about these experiences from a large group of people, this study turns to a genderqueer community on the social media site Reddit. Discourse analysis of discussion threads and content analysis of selfies reveal various symbolic mechanisms through which nonbinary people do, redo, and undo gender. These findings illuminate a range of strategies that people utilize to negotiate gender attribution within the gender binary system. A video abstract is available at http://tinyurl.com/y7odrxbd.