What do we mean by side hustle? A side hustle is a business you can start on the side—for example, while you’re still in school, or while you already have a job. Many businesses start out as side hustles and later become full-fledged businesses. Starting a side hustle is a way to test the waters of entrepreneurship. For this challenge, we want you to tell us about YOUR side hustle! It can be a business you’re already working on, or one you want to start.