Is it farther or further?
An expression of disagreement, contempt, etc; bullshit (1920s+)
Idle and meaningless talk; falsehoods and vanities; baloney, bunk: a lot of romantic blah (1918+)
[echoic; but first sense said to be fr French blase´, ''indifferent, bored'']
Incessant talking: Her mother-in-law is blah-blah, blah-blah-blah