Sensational or exaggerated publicity; extravagant advertising or promotional hype designed to attract attention and excitement.
From Ballyhooly, an Irish village, or possibly from carnival slang combining 'ball' and a shout. The term became popular in American English during the early 20th century carnival and circus eras.
'Ballyhoo' captures the sound and spirit of carnival barkers—the term itself sounds like exaggerated shouting and hype, which is why it perfectly describes over-the-top advertising; it's onomatopoeia combined with American carnival culture.
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