1US informal, dialect, historical 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".
2Of music or noise: cacophonous, discordant, noisy.
nounUS informal, dialect, historical
A member of a callithumpian band.
Early 19th century; earliest use found in Columbian. Probably from an arbitrary first element + thump + -ian.