from Wiktionary, Creative Commons Attribution/Share-Alike License.
- interjection A
put-downto silence someone whowould otherwise not stop talking.
- interjection A stand-in for trivial, obvious, or boring content.
Sorry, no etymologies found.
Sometimes campaign talk is like blah blah blah, but this is way more than that.
Crooks and Liars Adam Bink 2010