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1.
Local nickname for Atlanta's Orbital Motorway, combining two southern US traditions, Racisim("Watermelon"-a slight on Atlanta's black population), and love of motor racing("400"-as in 400 miles; refering to the length of a NASCAR race).
I took me two hours to get in: the Watermelon 400 was at at a standstill.
by Comrade Mister Yamamoto August 27, 2005