Footy legend Fatty Vautin makes some VERY rude comments about Karl Stefanovic's manhood on Today - leaving host Sarah Abo in stitches

Rugby league great and Channel Nine personality Paul 'Fatty' Vautin has left the Today show panel in fits of laughter after making some very rude comments about host Karl Stefanovic's manhood on Wednesday morning.

The Manly star turned Footy Show host and commentator was appearing on the program alongside Brisbane Broncos stars Adam Reynolds and Corey Oates as they prepared to play in a pro-am event with golfer Robert MacIntyre.

After discussing Wednesday's tournament at the Royal Queensland Golf Club, Vautin ambushed the hosts and sports presenter Alex Cullen with a story about what he saw when he joined Stefanovic in the toilets at a State of Origin footy match.

'I was at the State of Origin, I saw him in the brasco, at the urinal - and Karl, I shouldn't admit this, but I snuck a peek,' he said, drawing a surprised yelp from Abo.

'Overwhelmed, weren't you?' Stefanovic interjected.

'The bad news for Karl is, I've got him covered,' Vautin said.

 The shocked hosts and Cullen laughed so hard they couldn't talk for a few seconds.

'Karl doesn't know what to say,' Cullen added when he recovered.

'I'm a gentleman, I don't talk about such things, but it's a true statement. I snuck a peek as well and it's true - if you don't use it, you lose it,' Stefanovic said.

'It feels like we're on the Footy Show in 1999,' entertainment reporter Brooke Boney joked.

Vautin is well known for his hilarious and risque comments on Channel Nine's footy coverage.

Back in June he stunned his co-hosts after Queensland won the first State of Origin match when he complained about how cold it was on the field in Adelaide.

'My testes...', he started, before making a shrinking gesture with his hands to make viewers and the panel well aware what he was talking about.

'They are about the size of almonds ... it's so cold here.'

And in March he left his colleagues in stitches as he recalled another story about meeting a star in the men's bathroom at a match - in this case, ex-Storm and Queensland skipper Cameron Smith.

'We were in the brasco before and Cameron was having a whizzer [urinating],' he said.

'A bloke then tapped Cameron on the shoulder and said 'can I have a photo?

'It wasn't the right time.'

Vautin, who is never afraid of being politically incorrect, then said, 'I think he [Smith] was worried about a bit of shrinkage,' leaving the panel - also featuring commentator James Bracey and footy legend Brad Fittler - in fits of laughter.