Definition of be at in English:

be at

phrase

informal
  • Be doing or trying to do.

    ‘what are you at there?’
    • ‘The question is just what are they at now?’
    • ‘‘So, what are you at now?’ I asked, just for conversation's sake.’
    • ‘What about Michelle, what is she at these days?’
    • ‘What is he at, opening his bloody mouth in the first place?’