n. twenty-five cents; a quarter coin. : Here's two-bits for your piggy bank.
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
two bits
"quarter," 1730, in ref. to the Mexican real, a large coin that was divided into eight bits (cf. piece of eight; see piece); hence two-bit (adj.) "cheap, tawdry," first recorded 1929.