The expression Yada Yada is an equivalent of “Blah Blah” and we can use it when something spoken is very uninteresting, tedious or boring.
Let’s see some examples :
– When he was talking about his life, all I heard was “Yada Yada”
– I met her at the cafeteria, she ordered a drink,Yada Yada … she gave me more than reason to leave her behind and I did. I just hate blind dates.