IdiomThe AbsurdEnglish

all wet

Meaning: Wrong to the point of being silly or unbelievable.

Example: “If you think the moon landing was faked, you're all wet.”

Origin: American slang for being completely wrong, on record from 1923, though no source manages to explain why wetness specifically came to stand for mistaken thinking. A related, slightly earlier sense — "wet" meaning ineffectual or feeble — appears by 1896, and the word's much older slang association with drunkenness, dating back to around 1700, may have fed into the idea of a mind too fogged or unsteady to be trusted. Whatever the precise chain, by the early 20th century "all wet" had become a standard, punchy way of dismissing an opinion as entirely mistaken.

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