BYOB
American SlangDefinition
Acronym for “bring your own bottle” (also beer/booze/beverage); indicates attendees should bring their own alcoholic drinks to a gathering or venue.
Examples
"The invite says the backyard hangout is BYOB, so bring your own drinks."
"We’re meeting at a BYOB sushi spot—grab a bottle of wine or a six-pack."
"For the beach bonfire, it’s BYOB, but we’ll bring coolers and ice."