two bits (n.)youdaoicibaDictYouDict[two bits 词源字典]
"quarter dollar," 1730, in reference to the Mexican real, a large coin that was divided into eight bits; see bit (n.1). Compare piece of eight (see piece (n.)). Two bits thus would have equaled a quarter of the coin. Hence two-bit (adj.) "cheap, tawdry," first recorded 1929.[two bits etymology, two bits origin, 英语词源]