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To do a mad dog

Posted by Véronique Gigot on July 02, 2000

Dear All,
who could help me understand the expression "to do a mad dog" in the following sentence: "Don't worry! I've got a great plan. We're going to do a mad dog. For the crack. Have you ever done it before?"
Precision: context: Iris English; it has to do with two persons who plan to leave a restaurant without paying. Thank you very much for your help. Best regards. Véronique Gigot