Conor McGregor has finally commented on his dad Tony's hilarious viral video that made "coinage" a new favourite word among hoards of Irish people.

Back in the summer, Tony McGregor took to social media to make the ultimate #FirstWorldProblem complaint.

In a video post, he took umbrage with the fact that he was given an unwieldy €17.30 change in coins after he tendered a "brand new €20 note" at a DART station in Dublin.

The video, in which he described being "not too plussed", quickly went viral.

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His MMA fighter son has now commented on his dad's video for the first time, and his reaction is both amusing and fitting.

When asked by Ariel Helwani on his MMA show what he thought of the video, McGregor joked: 

"I'll tell you what I'm thinking, I'm thinking 'Where’s me ma to get that man’s phone out of his bleedin hands?' Somebody get that man's phone off him!

"Up the McGregors", he added with a laugh.

McGregor was doing press as he prepares to return to the UFC this Saturday with a highly-hyped fight with Khabib Nurmagomedov.

In the same interview, the Irish MMA star also confirmed for the first time that he had donated €10,000 to a GoFundMe page raising money for a young Irish boy named Bryan McCullough.

The money had been donated anonymously, but Bryan's mum Grainne later received an email saying the donation was made in McGregor's name.

He said: "A kid named Bru, I read something. It came across my lap. I read a story, I do this a few times. I felt this kids pain. He had a tube up his nose and the kid has cerebral palsy.

"When I heard that I felt the kid's pain he has a tube that feeds him through his nose and he keeps pulling it out of his nose and he can't understand why he shouldn't do it. I just felt the kids pain and I just donated to the GoFundMe."

He added: "I've done some good things, Ariel, I'm not all f***in' bad."