The filters are off!

Australians are making an entertaining habit of losing themselves in the euphoria of Olympic gold, with Kaylee McKeown the latest to deliver another classic Games memory outside of actual competition.

Just a day after coach Dean Boxall found internet fame celebrating his young charge’s gold in the 400m freestyle final, McKeown also let loose after bringing home Australia’s third gold of the Tokyo Games.

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Interviewed poolside after her momentous win in the 100m backstroke final, the 20-year-old was asked if she’d like to send a message to her family back in Australia.

“F*** yeah,” she yelled, before realising her little slip, “Oh s***”.

McKeown's triumph is Australia's third gold of the Games, following the women's 4x100m freestyle relay and Ariarne Titmus in the 400m freestyle.

World record holder McKeown entered Tuesday's final as the third-fastest qualifier behind American Regan Smith and Canada's Kylie Masse.

And the Australian trailed her feted rivals at the last turn before a stunning surge in the final 30 metres delivered victory.

McKeown triumphed in 57.47 seconds, with Masse (57.72) taking silver and Smith (58.05) the bronze.

Her triumph comes against a backdrop of family tragedy, with her father losing his battle against brain cancer last August.

“I hope you’re proud and I’ll keep doing you proud,” she said when asked what she would like to say to him.

With AAP