Disgruntled Qantas passengers have been known to say it, others will think it, but The Project’s Carrie Bickmore was left red-faced after saying it on national TV.

A common name play on the national carrier, Ms Bickmore’s line was to read ‘Qantas customers’ but she mistakenly meshed the two words and blurted out an obscenity which had the panel fighting laughter from the blooper.

Following the show, Ms Bickmore tweeted in good humour "Any publicity is good publicity right??!! Sorry @qantasairways and my nan."

Qantas replied to the tweet, forgiving the blunder by saying "We forgive you Carrie. We're sure it wasn't intentional :)".

To hear it for yourself, click on the video below.  Please don't hit play if you are offended by very coarse language, accidental or otherwise