The use of "Raspberry" for the bilabial fricative (or Bronx Cheer, if you prefer) comes from Cockney rhyming slang, in which the first word of a two word phrase stands in for a word that rhymes with the second word of the phrase. In this case, Rasberry Tarts rhymes with Farts.
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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