Etymology
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codswallop (n.)

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).

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Definitions of codswallop

codswallop (n.)
nonsensical talk or writing;
Synonyms: folderol / rubbish / tripe / trumpery / trash / wish-wash / applesauce
From wordnet.princeton.edu