A Canadian influencer has noticed a very unusual phrase that all Australians say. He can’t understand it.

Josiah Hein, who is currently touring Australia and sharing the strange differences between Down Under and his native Canada.

On TikTok, where he has 88,000 followers, Josiah shared a short clip that was likely filmed at Costco.

The likeable influencer admitted he was surprised by how often Australians use the word “passionate” to express enthusiasm or excitement.

“In Australia, they say ‘encouraged’ instead of ‘down,’ or ‘I’m keen’ instead of ‘I’m down,’” Josiah said in the clip.

“So if you say, ‘Dude, do you want to go to the movies?’ they’ll just text you, ‘I’m up for it.’ Everyone I know would say, ‘I’m up for it,’ or ‘I’m up for it, man, join me,’ but here it’s more like, ‘I’m up for it.’

Josiah also couldn’t explain the extended version of Australian slang.

“Australians sometimes say, ‘I’m very keen, bro,’” he said with a wry, questioning smile.

Canadian TikTok user Josiah Hein admitted he was surprised by how often Australians use the word “eager” to express enthusiasm or excitement

Josiah’s Antipodean supporters quickly began educating him in local linguistics.

“Because ‘willing’ is a real word in the dictionary meaning willing. Saying I’m down is slang,” one fan wrote.

Others were quick to point out that the term “keen as mustard” comes from the much-loved Keens mustard powder, which has long been a staple in the Australian pantry.

However, one fan suggested that the slang is not of Australian origin at all, but is featured in American TV shows such as The Brady Bunch.

“I’m pretty sure it’s from American television from the 50s and 60s,” they said. “I’m very keen, Marcia Marcia Marcia.”

Josiah couldn’t explain the extended version either – spicy as mustard.

However, one pedantic fan noticed further nuance in the discussion, arguing that “to be” does not necessarily mean “to be”.

“Keen is willing, but there is no clear yes answer,” they wrote.

Josiah managed to upset many Australians in 2023 when he mispronounced the names of the Australian cities of Melbourne and Canberra in a “rage-inducing” video.

Arriving in the Australian Capital Territory, Josiah referred to the acronym as “act” instead of ACT and added that it was “confusing” that the capital of Australia was a city “nobody had heard of”.

He also mispronounced the name Melbourne as “Mell-born” instead of “Mel-bin”, and the name Canberra as “Cane-berr-ah” instead of “Can-brah”.

Josiah’s Antipodean followers quickly began educating him in local linguistics.