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Wouldn't call that a waste of time
16 11, 9:10am
I'm having difficulty finding it now, but I *think* this originated as a meme. The meme being about how Australians will immediately back up claims like this without hesitation. So, American goes to the bar, Australian tells him about the phrase, and all the Aussies nearby say, "Yeah, absolutely! Totally a thing!"
I could be mixing this up with something completely different, so I'm not certain. But it would definitely make sense with the number of Aussies that say they've never heard this phrase.
The meme got pretty big, though, so maybe it's a real thing now? I see tons and tons of sources for it.