"Conversation": a word signifying nothing, as in "we need to have a national conversation on this"

Robert J. Mack  "So, next time you hear a politician or a news analyst use the word "conversation," be very afraid. That word has become the weapon of choice used by the propaganda specialists in politics and media to bamboozle the American people. You will know that in that "conversation" no one won the debate with a vigorous defense of the facts, no minds were changed, and nothing of significance happened. Oh, and by the way, the bamboozled went away happy."  Read more: American Thinker

For example: How to Have an Unconventional National Conversation about Guns and then there is this: Labor Becomes Part of the National Conversation: The Best and Worst of 2012.

You could call this a national conversation about the use of the term "national conversation".

The New Yorker