Definition of bar useful in English:

bar useful

noun

Australian
  • An employee who does general work in a hotel or bar.

    ‘a bar useful had occasion to go over and require them to make less noise’
    • ‘He was harder to get chips and squashes off than the bar usefuls.’
    • ‘He was on some occasions assisted by a bar-useful.’
    • ‘I was employed as a 'bar useful' looking after three of the bars and learning the ropes.’