Barack Obama has the perfect response when discussing Donald Trump's potential presidency

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It's no secret that current US President Barack Obama isn't a fan of Donald Trump, and as a result he has coined a new catchphrase during his bid to rally voters to back Democratic presidential nominee Hillary Clinton.

"C'mon, man."

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In Fayetteville, North Carolina, on Friday, Obama railed against Trump backers who the president said make excuses or justify things the presidential candidate has said that would be "completely disqualifying" for another candidate.

"We hear people justifying it and making excuses about it and saying, 'Well, you know, he didn't really mean it,' or 'it's locker-room talk,' or 'well, maybe he did mean it but as long as he supports tax cuts for the rich' or 'as long as he supports doing the things we want to do, it's OK,'" Obama said.

"C'mon man," he added, riling up the crowd. "We can't be thinking somehow that just because he agrees with you on some policy issue or just because you're frustrated with government that it's OK to display the kind of behaviour he displays."

Barack Obama at a rally.
(Chuck Burton/AP)

A day earlier in Miami, Obama criticised Trump for being so thin-skinned that he can't take the banter of a Saturday Night Live TV skit.

"This is a guy who, like, tweets they should cancel Saturday Night Live -- 'I don't like how Alec Baldwin is imitating me.' Really?" Obama said.

"I mean, that's the thing that bothers you, and you want to be president of the United States? C'mon, man. C'mon," as the audience applauded its approval.

Asked whether "C'mon, man" is Obama's new, "Yes, We Can," White House spokesman Eric Schultz said: "I think it's trending." Not that Trump was happy with that...