Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
icky
1935, Amer.Eng., probably from icky-boo (c.1920) "sickly, nauseated," probably baby talk elaboration of sick. Originally a swing lover's term for more sentimental jazz music.