to discourse at length in a pompous or boastful manner (slang)
A form of this word ("bloviations") showed up in a Paul Krugman article today: "From inevitability to pitiful failure to front-runner again in just a few days. There’s no hint that the market saw either Iowa or New Hampshire coming, or knew anything beyond the bloviations of the talking heads." I can't remember ever having seen this word before, so I looked it up.
"....bloviations of the talking heads." Kind of goes with their blah, blah, blahs, doesn't it? It's one of those words that sounds like what it means, to me.
I was thinking the same thing.