boo (third-person singular simple present boos, present participle booing , simple past and past participle booed ) When he took the podium, the crowd booed . Substitute Charlie Austin scored seven minutes into his Southampton debut as a lacklustre Manchester United were booed off at Old Trafford. The meaning of BOO is —used to express contempt or disapproval or to startle or frighten. How to use boo in a sentence. Have you ever been called " Boo Boo " by a friend, family member, or romantic partner and wondered what it truly means ? This playful nickname can carry various connotations depending on the context, tone, and relationship dynamics. Understanding the significance behind this term can help you interpret the message accurately and respond appropriately. In this article, we'll explore the origins of the term, common interpretations, and how to handle such a nickname when it’s used toward you. Boo is a slang term that can mean a ghost, a significant other, a close friend, or a playful tease. Learn about its origins, different contexts, case studies, statistics, and regional variations.