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Used as a code word over the phone. The person on the other line must guess it however if they do not know you add things to "green cow" such as my green cow space to say the word myspace.
Julie:I dont know she sent my something on green cow.
Julie: on my green cow space.
Mike: oh, o.k. on your myspace.
Julie: Exactly!
by Retniapdoolb October 21, 2007
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