mod. tiny. : Give me an itsy-bitsy piece. I'm on a diet.
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
itsy-bitsy
1938, "charmingly small," from itty (1798, in a letter of Jane Austen), baby-talk form of little.