The former Grey's Anatomy actor was promoting new film Bridget Jones's Baby alongside co-star Renee Zellweger on the Today show on Sunday (21Aug16), when he tried to impress the hosts with his knowledge of Aussie speak.

"Traveller," he began. "Traveller's a beer you travel with right?"

Patrick's comment prompted the TV presenters to burst into laughter - because it actually refers to a man becoming aroused while taking public transport.

"You're not supposed to say that," co-host Richard Wilkins quipped, much to Dempsey's confusion, as he asked, "What's a traveller? Have I alienated everyone in the country?".

The topic of conversation was quickly changed, but Patrick refused to let the issue go and later raised the question again while still on air.

"What the heck is a traveller?" he exclaimed.

As Wilkinson whispered the real meaning in his ear, an embarrassed Dempsey apologised to the audience, saying, "Oh, excuse me!"