One of the mysteries of the English language finally explained.
1US informal and regional (originally north-east.). Designating a group of people making cacophonous music or noise using a variety of instruments, utensils, etc., as a demonstration of a general feeling of celebration, dissatisfaction, etc.; of or relating to such a band or its music. Frequently in "callithumpian band", "callithumpian serenade". Now historical.
2Of music or noise: cacophonous, discordant, noisy.
US informal and regional (originally north-east.). A member of a callithumpian band. Now historical.
Early 19th century; earliest use found in Columbian. Probably from an arbitrary first element + thump + -ian.
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