/blah/ , Slang.
n.
1. nonsense; rubbish: What they say is blah.
2. the blahs , a feeling of physical uneasiness, general discomfort, or mild depression; malaise: After the long weekend many workers had the Monday-morning blahs.
adj.
3. insipid; dull; uninteresting.
[ 1915-20; imit. ]
Syn. 1. bunkum, humbug, hooey, eyewash, twaddle, bosh.