Fella/ˈfelər/ Definition 1 of 1Pro Tip 1/3Informal Use Used in casual situations, not in formal writing or speeches. I met this fella at the cafe. Pro Tip 2/3Friendly Tone Implies friendliness or affection, less distant than 'man' or 'gentleman'. Don't worry, that fella can help you out. Pro Tip 3/3Gender Specific Refers only to males, can be a boy or an adult man. See that young fella playing football?