BYO, which stands for "Bring Your Own," is often used in social settings to encourage guests to bring their own food, drinks, or other items to an event. However, there are many synonyms for BYO that can be used to convey a similar message. For example, BYOB, which stands for "Bring Your Own Booze," is commonly used at gatherings where alcohol is permitted. Other options include "Potluck," which suggests that guests should each bring a dish to share, and "DIY," which encourages guests to create their own items rather than relying on the event host. Ultimately, choosing the right synonym for BYO depends on the specific nature of the gathering and what guests are expected to bring.