Definition of B & S in English:

B & S

noun

Australian
  • A dance held for single people, typically in a rural area.

    ‘it's kind of like a B & S without the alcohol’
    as modifier ‘a B & S ball’
    • ‘It's kind of like a B&S without the alcohol.’
    • ‘I've spent gawd-knows how many nights sleeping in cars at music festivals and B&S's.’
    • ‘The B&S is an icon of outback Australian dating and drinking.’
    • ‘She's been going to B&S balls for quite a few years.’
    • ‘He's no longer doing the B&S and country party scene.’

Origin

Early 20th century: from the initials of Bachelors' & Spinsters'.