Patrick Dempsey's Erection Embarrassment on Live TV

Ahhhh awks! Patrick Dempsey AKA McDreamy had a crack at some Aussie lingo on TV but accidentally ended up talking about erections.

The former Grey's Anatomy star appeared on Channel Nine's Today show with Renée Zellweger to promote their new movie, Bridget Jones's Baby.

After Renée Zellweger attempted to speak with an Aussie accent, co-host Lisa Wilkinson asked Dempsey if he'd like to have a go.

But instead of attempting an Aussie accent, he instead tried to show off his Aussie lingo.

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

Karl Stefanovic immediately burst into laughter with Richard Wilkins telling the movie star, "You're not supposed to say that".

A confused Dempsey asked, "What's a traveller? Have I just alienated everyone in the country?"

Wilkinson said, "All the blokes who are watching are sitting upright now".

Later in the interview, Dempsey asked again, "What the heck is a traveller?"

Wilkins leaned over to the star and whispered the answer in his ear.

"Traveller" is a term used to describe an erection that develops while on public transport.

After being educated by Wilkins, a clearly embarrassed Dempsey said, "Oh, excuse me".