ya ‧ da ya ‧ da ya ‧ da BrE AmE , yadda yadda yadda /ˌjædə jædə ˈjædə/ interjection American English spoken
said when you do not want to give a lot of detailed information, because it is boring or because the person you are talking to already knows it SYN blah, blah, blah :
I started talking to her and – yada yada yada – it turns out she’s from New York too.