An expression of distaste, disgust or general ew-ness.
The correct pronunciation should create a noise similar to a scream of terror expressed when a zombie bites your jugular. Not to be confused with bleh or blech, which are not nearly as epically awesome.
My hair is a lovely shade of bleeaah.
Bleeaah! There's crap on that!
by Dierkeshyde April 20, 2008
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