A stupid fellow, a muff. Slang.

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1856.  

        So off he went with good three hundred “scads,”
The free donations of the many lads
Who seemed to think the actor very green;
But who, I ask, is most of a sardine?
‘Sacramento City Item,’ n.d.    

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1857.  “Answer the question.” “Answer it yourself, if you can. I’m no sardine.”San Francisco Call, March 26.

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