said to be from 19c. (but first attested 1959), perhaps from wallop, British slang for "beer," and cod in one of its various senses, perhaps "testicles" (a 1966 citation in OED spells it cod's wallop).
updated on January 10, 2018
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。