Could it be a simple corruption of the "smetocks" part of the term for the horse clam?
One of my sources of misinformation (and not the only one, I'm sure, since this one doesn't refer to the "fifteen pounds" that I remember) was The American Heritage Dictionary of the English Language. I quote: "Geoduck n. Also gwe-duc. A very large, edible clam, Panope generosa, of the Pacific coast of northwestern North America. [Chinook jargon go-duck.]
So much for "reliable sources!" Thanks, Phil.
Sandy
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