"Willy" is a slang term for the penis that appeared in English in the 19th century, likely as a diminutive or playful form of the name "William," following a pattern of using common male names for body parts. It is used mainly in informal, child-friendly, or humorous contexts, often to avoid vulgarity or bluntness. The term is generally neutral to mildly informal, not offensive, and rarely used in serious or clinical speech.

英語での「willy」の定義と意味

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