drum talk
noun1
Communication over distance effected through the means of drums.
- The half-breed shrugged his broad shoulders. "The Indians know. They have their own way. They watch us. They talk the drum talk to each other. Kill us if they can." By the afternoon of that day - my pocket diary shows me that it was Tuesday, August 18th - at least six or seven drums were throbbing from various points.1912, Arthur Conan Doyle, The Lost World […], London; New York, N.Y.: Hodder and Stoughton, →OCLC: