Longman Dictionary of Contemporary English - blah

~1 n 1 blah, blah, blah spoken used when you do not need to complete what you are saying because it is boring or because the person you are talking to already knows it  (The answer to question 3, `which South American country has blah, blah, blah?' is Argentina.) 2 BrE spoken remarks or statements that are boring and do not mean much  (the usual blah about everyone working harder) ~2 adj AmE spoken 1 not having an interesting taste, appearance, character etc  (The decor of the house was kind of blah.) 2 slightly unwell or unhappy  (I feel really blah today.)