Blah ! /blä/
Written only as an Exclamation:
Used to substitute for actual words in contexts where they are felt to be too tedious or lengthy to give in full.


From Star Trek The Next Generation: Data/Graves: [from his eulogy on Graves] I can safely say, that to know him, was to love him. And to love him, was to know him. Those who knew him, loved him, while those who did not know him, loved him from afar.