Bunkum
Etymology
An eponym from American politics. Around 1820, Congressman Felix Walker insisted on delivering a long, irrelevant speech, explaining he was not speaking to the House but "for Buncombe," his home county in North Carolina. "Speaking for Buncombe" became shorthand for grandstanding, shortened to "bunkum," and later clipped again to "bunk."
noun · /BUNK-um/
Insincere or empty talk, especially the kind meant to impress or deceive.
What it names
Hollow rhetoric performed for effect — words spoken to be seen speaking, not to say anything.
Example
The quarterly all-hands was pure bunkum — twenty slides of momentum and not one real number.
Related idea
Bunkum is empty talk performed to impress an audience; balderdash is nonsense that may be sincere but simply makes no sense — bunkum has a motive, balderdash need not.