Here's a political quote that addresses what the phrase "Kumbaya moment" has come to mean in the USA:

"KUMBAYA

In what may have been the most nonpartisan moment of this past summer, the official White House portraits of Bill Clinton and his wife, Senator Hillary Rodham Clinton, were unveiled in an unabashedly sentimental ceremony. President Bush praised his predecessor as a man ''with far-ranging knowledge of public policy, a great compassion for people in need,'' and ''42,'' as Bush nicknamed him, was grateful ''for all those kind and generous things you've said.'' David Sanger, a Times reporter, wrote, ''Graciousness oozed from all sides,'' and Representative Rahm Emanuel, Democrat of Illinois, who had been one of Clinton's most effectively partisan White House aides, noted, ''I thought everybody was going to break out in 'Kumbaya.'''

As the campaign heated up, the conservative radio talk-show host Laura Ingraham told Larry King of CNN that ''while this kumbaya moment that we're all sharing about party unity is wonderful, the truth of the matter is -- '' and then popped Senator Kerry for his blast at the president for outsourcing the hunt for Osama bin Laden. John Tierney of The Times, in his lively Political Points column, quoted Kerry's call for a ''more sensitive war on terror'' and awarded him the ''Kumbaya Prize.'' "

http://www.cmicdf.org/News/the--62-magazine-62-on-language-gaming.html

-snip-

So what does "Kumbaya moment" mean?

How about "an occurance or event noted for its participant/s expression of fake admiration or affection for an individual or for a group of people, or for an another person's accomplishment/s"?

Needless to say, I'm open to "hearing" what you think this relatively newly coined phrase means.

{Relatively newly coined=less than 10 years old. That's just a guess as I'm not sure how long the phrase "kumbaya moment" has been in use. But I don't think the phrase has been used for a long time}.