The definition of dah is quite simple. The word itself means something like an ironic yes. Originally it comes from the russian da. This word means yes. This word has then been picked up and is now being used again and again in its original russian form. Though the tone has been changed a little.
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Will Smith' invented it.
Meaning from Cool to yes!.
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Dumb As Hell, an adjective describing someone who is beyond dumb
Boy, you dah (each letter said individually)
or
Boy, you dumb as hell
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A substitute for words to a song that you don't know.
Dah Dah Dah Dah Dah! DAH DAH!!!
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