From the trivial nonsense file we have International Yada Yada Yada Day which is celebrated each July 23rd.
The phrase said to mean "so on and so forth" or "blah, blah, blah" became popular on an episode of the American sitcom "Seinfeld".
"The Yada Yada" was the 19th episode of the eighth season which made it the 153rd episode.
The observance was created by one Michael W Casby who obviously is easily amused. It is a convenient cover up for those details better omitted from polite company.
Likely a highly effective interpersonal tool for those of us continually accused of TMI (too much information).
You may or not use the term in your travels. I think I may have uttered it once under my breath many moons ago. Perhaps had I been more of a fan of Seinfeld in general — but at that time I was teaching college and didn't go for such drivel.
Regardless, happy International Yada Yada Yada Day oh ye with little to do. Now yada your ass on out of here.