(also yadda yadda yadda ) / ˌjædə jædə ˈjædə; NAmE / exclamation
( NAmE , informal ) used when you are talking about sth to show that some of the details are not worth saying because they are not important or are boring or obvious :
His new girlfriend is attractive, funny, smart, yada yada yada.
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WORD ORIGIN
1940s: imitative of meaningless chatter.