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Deriving from both, this word merges the typical "blah" and "bleh" expressions used to describe a persons lack of interest, boredom, and/or "whatever" feeling. "Blaeh" can be used when messaging a friend to describe an unexcited feeling or when one has run out of things to say/ is bored enough to reduce his or herself to nonsensical words.
Girl: "lol"

Boy: ....

*Minutes later*

Boy: "blaeh"

Girl: "blaeh, haha, how was your day?"

Boy: "Blaeh"

Girl: "Why blaeh?"

Boy: "Well not much happened, and it was pretty boring"
by Ishnessbby November 02, 2010
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