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Look up BYOB in Wiktionary, the free dictionary.
BYOB is an initialism used on party invitations, meaning "bring your own beverage" or variants. BYOB may also refer to:
- B.Y.O.B. (song), a song by System of a Down from their album Mezmerize
- BYOB (programming language), a computer programming language
- Bring your own bag, a government campaign to discourage plastic shopping bag use
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