n. a small or timid man or boy. (Also a term of address.) : Shut up, you little pipsqueak, or I'll hit you.
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
pipsqueak
1910, from the trivial noise a young or weak creature makes.