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A massive, seemly non-human, DUMP. This can be in the form of a hammer head or the prairie dog variety but most often follows a two day drinking and eating binge.
On the way to the party, I had to stop and take a Gnarly Duke.

I just laid down a Gnarly Duke.

I'll be over to help you move your stuff but I have to take a Gnarly Duke first.
by wood dick May 25, 2011
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