Basic Guidelines For English Spellings
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exclamation
informal USIndicating (usually dismissively) that further details are predictable or evident from what has preceded: ‘and so on’, ‘blah blah blah’.
noun
informal USTrivial, meaningless, or uninteresting talk or writing; chatter.
Origin
1960s. Imitative of the sound of human speech, probably influenced by (or perhaps an alteration of) yatter.
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