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".

Of music or noise: cacophonous, discordant, noisy.

A member of a callithumpian band.