Definition of put (or lay) on jam in English:

put (or lay) on jam

phrase

Australian
informal
  • Adopt an affected way of speaking or an affected manner.

    ‘when nervous, she tends to put on jam’
    • ‘They wanted to know everything about him; if he was "a proud or bashful sort of man?" and if he "put on jam?"’
    • ‘One girl said I put on jam but I don't talk funny.’
    • ‘I loved people who did not put on 'Jam'.’
    • ‘A few of the educated people we came across were, by their accent, "putting on jam".’
    • ‘She has been putting on jam to some extent.’