1677, "a trick, a hoax, a fraud," perhaps from sham, a northern dialectal variant of shame (q.v.). Sense of "Something meant to be mistaken for something else" is from 1728. The meaning in pillow-sham (1721) is from the notion of "counterfeit." The adj. is attested from 1681;
n. champagne. : Would you like a little more shammy? , I want the biggest bottle of cham you got!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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