Letters on some invitations

• Low-budget party letters
• Caveat on a cheapskate's BBQ invite
• T.G.I.F. party request
• Inits. on a party invitation
• Party letters
• Part of an invitation to a drinker (abbr.)
• [Guests must provide their drinks]
• Abbr. on some invitations

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.