Definition of Yank-happy in English:

Yank-happy

adjective

Australian
dated, informal
  • (of a woman during the Second World War) associating with American servicemen.

    ‘like so many of the Brisbane girls, I was Yank-happy’
    • ‘Most of our girls have gone Yank happy.’
    • ‘She had become Yank happy like so many other girls who were fluttering gaily with American soldiers.’