byob
BYOB is an acronym with several similar yet related expansions. The acronym is most often associated with a social gathering (a party) at which the host will not be providing alcoholic beverages; the guests are invited to bring a beverage of their choice for their own consumption.

Common expansions of the acronym include:

Bring Your Own Bottle 
Bring Your Own Booze 
Bring Your Own Beer 
Bring Your Own Beverage
not applicable, see above