In late 1964 Monica Dickens was visiting Australia to promote her works. It was reported in the Sydney Morning Herald on 30 November 1964 that during a book signing session in Sydney she had been approached by a woman who handed her a copy of her book and enquired, presumably in a broad Australian accent, "How much is it?". Dickens reportedly misheard this as an instruction as to the name which she should include in the inscription ("Emma Chisit") and thus was born the phenomenon of "Strine" which filled the newspaper's letter columns and subsequently was the subject of a separate weekly article and, later, a series of humorous books.
Or so I'm lead to believe.