run tell dat

Go ahead and tattle. Used, esp by children, to taunt or challenge someone known to be a tattle-tell to really go and tell the whole story. Often preceded by the word "go"

Child: "Ooooh, I saw you kissin Shaniqua behind the bungaloos!"
Teenager: "And I teabagged her too. Go run tell dat!"

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Wimp: "Ugh! I know it was you who threw that snot rag at me! I'm going to tell Mr. Franklin."
Bully: "That wasn't snot, stupid. Hahaha. Go run tell dat!"

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