On Urban Dictionary and across social event slang terminology, the acronym BYOW stands for "Bring Your Own Weed" or occasionally "Bring Your Own Wine" depending entirely on the specific demographic and nature of the party being hosted. When specified on an invitation, it acts as a clear instruction that the host is not providing that particular consumable item, requiring attendees to supply their own personal recreational substances or alcoholic beverages. This practice helps manage party costs and ensures guests bring exactly what they prefer to consume during the social gathering.