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A response given when someone or something has done you wrong, when things just aren't right with a scenario or simply just isn't what you expected to happen.

Someone who does you dirty could be described as "dusty"
Person One: "I'm so upset. John said he was going to us his extra ticket to take me to the game tonight, but instead he brought his girlfriend."

Person Two: "Bro, I'm so sorry that's that straight dust"
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