Balum Rancum Meaning

(idiomatic, obsolete, slang) A dance, performed by a company of prostitutes naked.

Example: 2006, Dewey Lambdin, The Gun Ketch, page 124:
  And just when did you last see decorous Sea Officers, Lewrie asked himself in wonder at such a ludicrous statement? Leaping rantipole and playing balum-rancum in church? Hymn-singing in brothels?