Definition of as if (or like) one owns the place in English:

as if (or like) one owns the place

phrase

informal
  • In an overbearing or self-important manner:

    ‘he would have walked in and taken charge as if he owned the place’
    • ‘If he walks up like he owns the place, he's probably going to treat women like property.’
    • ‘She walks around my apartment as if she owns the place and tells me what I can and can't do and the way it's going to be.’