It refers to the practice of bringing your own alcoholic beverages to an establishment where they are not sold or provided. Typically, this involves restaurants, bars, or events that have obtained liquor licenses but choose not to offer a full range of alcoholic beverages. BYOB stands for bring your own bottle, a request to guests to bring their own alcoholic drinks to a party. Learn more about the meaning, usage and translations of this abbreviation in different languages. 58 definitions of BYOB. Definition of BYOB in Slang/Internet Slang. What does BYOB stand for? See the meaning, origin, examples, and context for the slang phrase BYOB with RedKiwi English guide.