Yes, blahs is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
blahs
Noun
1. A general feeling of boredom and dissatisfaction
2. Pompous or pretentious talk or writing
What Scrabble words can I make with the letters in blahs?
4 Letter Words
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Words that can be created with an extra letter added to blahs:
U:ablush