1573, "resembling skin," from skin (n.). Meaning "emaciated" is recorded from 1605. In the sense of "the truth" it is World War II military slang, perhaps from the notion of the "naked" truth. Skinny-dip first recorded 1950s.
n. inside information. : I've got the hot skinny on Mary and her boyfriend.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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