Why is raspberry used as a name for an insulting sound?

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The term "raspberry," when used to describe an insulting sound of contempt, originates from rhyming slang.12

In this linguistic context, "raspberry" is a shortened form of the phrase "raspberry tart," which serves as a rhyming euphemism for "fart". The sound itself—produced by protruding the tongue between the lips and forcibly expelling air to create a vibration—is also commonly referred to as a Bronx cheer.1234