Party stipulation, briefly

• Informal invitation letters
• Party abbr. about drinks
• Like many restaurants without a liquor lic.
• Abbr. about alcohol on a party invitation
• Caveat on a cheapskate's BBQ invite
• Inits. on a party invitation
• Party letters
• [Guests must provide their drinks]
• Drinker's party instruction, for short

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
initialism (acronym) for "bring your own bottle" or "bring your own booze," by 1951.