blah blah blah
⇨ blah; blah blah; blah blah blah
noun empty and meaningless talk; so on and so forth; used for implying that what is being said is not worth the saying or has been said too often already. Echoic of nonsense speech, possibly German
blech (nonsense); synonymous with
RHUBARB (nonsense) which may also be repeated two or three times for emphasis
UK, 1918