My goodness!
Notice my mood today?
I've always thought of it as a sound people make but when I visited dictionary.com, the "sound" has a meaning! What a surprise~ LoL

blah
n.

Worthless nonsense; drivel.

blahs A general feeling of discomfort, dissatisfaction, or depression: “Monday morning Oscar woke up with the blahs” (New Yorker).

adj.

Dull and uninteresting.

Low in spirit or health; down: sat around all day feeling blah.

And..
Belah

destroying

Hahaha.. The Malay meaning of the word belah is to get lost/go away.. LoL
Interesting things we can learn from the net, eh? ;)