/ blɑː; NAmE / noun , adjective
■ noun
[ U ] ( informal ) people say blah, blah, blah , when they do not want to give the exact words that sb has said or written because they think they are not important or are boring :
They said, 'Come in, sit down, blah, blah, blah, sign here'.
■ adjective ( NAmE , informal )
1.
not interesting :
The movie was pretty blah.
2.
not feeling well; feeling slightly unhappy
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WORD ORIGIN
early 20th cent. (originally US): imitative.