Top Definition
A stiff rejection of someone's complaint, idea or thought with the intent of neither acknowledgment of said utterance nor progression of the conversation. Also removing the need and desire for the complainer to rebuttal due to their fury induced blindness, thus also retarding said person from saying anything that useless again. Pronounced as if a British person said "blur" basically eliminating the "r".
-"I don't mean to beat a dead horse, but I still cant believe that you don't think people can read minds!!"
-"Oh Blah!"
by Blahman333 August 19, 2009

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