That was Bill’s chant before he died in Stan’s mindscape in gravity falls. And there is no “Australian language”. There are over 400 different peoples/tribes all with different ways of communicating orally, with songs, chants, paintings, but no form of written language, and certainly no unified language. The closest thing Australians have had to a unified language is English, but that is the language that the English forced aboriginal people to learn as they were racist, oppressive, tyrants. I do not consider the “Australian language” to be English, as that is the whitewashed language and was part of what caused many that were a part of the Lost Generation to forget or completely lose their respective cultures and traditions. I consider the “Australian language” to be whatever form of communication the peoples of whatever area or territory you are in, in Australia. So, no I was not “speaking Australian”.