RBUs refer to words like smiles, sunshine,
balloons, bunnies, kittens, and lollipops. In a 1981 monologue, Steve
Martin declares that he believes in "rainbows and puppy dogs and fairy
tales." Three-syllable nouns, it seems, tend to be favored for rainbow
collocations; specifically, three-syllable nouns consisting of an
unstressed syllable sandwiched between two stressed syllables:
BUTTerflies, Unicorns, LOLlipops, PUPpydogs, FAIRy tales. This kind of
three-syllable string is known in poetry circles as a cretic.
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