blah blah blah
intj
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A put-down to silence someone who would otherwise not stop talking.
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A stand-in for trivial, obvious, or boring content.
yada yada yada
phrase
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blah blah blah.
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And so on; and so forth.
How often have the words blah blah blah and yada yada yada occurred in a corpus of books? (source: Google Ngram Viewer )