Wiktionary
alt. 1 And so on; and so forth. 2 (less commonly): blah blah blah. phr. 1 And so on; and so forth. 2 (less commonly): blah blah blah.
Usage examples of "yada yada yada".
A psychologist, retired, sick of listening to people's problems, Social Security number yada yada yada, unmarried, homosexual, HIV-positive, like to eye gorgeous boys eying themselves in the mirrors at the gym but don't pursue, don't strike up conversations, don't cruise gay bars or date.
Then he calls the police and hostage rescue surrounds the house, yada yada yada, the whole nine yards, while the president goes to his bank to get the ransom.
Grandmere claims this will have everyone BEGGING her to live on the faux island of Genovia, leaving poor John Paul Reynolds-Abernathy the Third out in the cold, yada yada yada.