When something or someone is being really bad and going completely against you. Also relates to not listening to someone. Other words that can be used to describe this one...
-bad
-rude
-selfish
-ignorant
Sally: You are a really bad pinecone Fred
Fred: What have I done now?
Sally: You said blah to my face when i talked about the aliens taking over Earth
(Fred walks away from Sally)
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When saying "blah" to someone, means you're not really listening and you don't care what they have to say to you. especially if it's something really important.
For example:
Sally: Did you watch those aliens attack our planet yesterday?
Fred: Blah
Sally: You are a bad pinecone
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