You use blah, blah, blah to refer to something that is said or written without giving the actual words, because you think that they are boring or unimportant.
[informal]
...the different challenges of their career, their need to change, to evolve, blahblah blah.
blah in British English
or blah blah (blɑː) slang
noun
1.
worthless or silly talk; claptrap
adjective
2.
uninteresting; insipid
verb
3. (intransitive)
to talk nonsense or boringly
Word origin
C20 imit
blah in American English
(blɑ)
US, Slang
noun
1.
boring, predictable, or nonsensical talk or writing
interjection
2.
used, usually repeated one or more times, to suggest such talk or writing, esp. when it continues for a long time
and the speaker went on, blah, blah, blah, seemingly forever
adjective Slang
3.
feeling or being dull and lifeless
Idioms:
the blahs
Word origin
echoic
Examples of 'blah' in a sentence
blah
And then we had not the right manager and not the right players blah blah blah '.
The Sun (2016)
What is not true is the accompanying guff about nature in the city and blah blah.
Times, Sunday Times (2015)
Tough upbringing in Islington blah blah blah.
The Sun (2014)
It makes you feel blah.
Times, Sunday Times (2008)
Instead, it's all a bit blah.
Times, Sunday Times (2015)
Now, with global warming, blah blah blah.
Times, Sunday Times (2007)
There's a battle raging between the government and a big ol' company for control of the search for a hospitable planet blah blah blah.