Codswallop

A widely repeated origin story credits Hiram Codd, who in 1872 patented a fizzy-drink bottle sealed with a glass marble (the "Codd-neck bottle"), and claims that beer drinkers dismissively called soft drinks "Codd's wallop" ("wallop" being old slang for beer), meaning weak, watered-down nonsense by comparison. It's a wonderfully specific story, but there's no documented evidence connecting Codd's bottle to the phrase at all. "Codswallop" isn't recorded anywhere in print until the 1950s and 60s, roughly eighty years after Codd's bottle had already gone out of fashion, which makes the tidy origin story very hard to believe.