interjection. A word used in conversation to reflect general indifference to a situation or object of conversation.

adjective. Mildly uncomfortable; not good.

"Here, I’ll paraphrase: “Blah blah, doesn’t work”, “Yadda Yadda costs too much”, “bleh bleh is a communist”, and “blah blah meddling in private industry.”"

blah  bled  blew