conga line

from WordNet (r) 3.0 (2006)

conga line
    n 1: a line of people in single file performing the conga dance

from The Collaborative International Dictionary of English v.0.48

conga line \conga line\ n.
   1. a line of persons dancing the conga[2].
      [PJC]

   2. a line of persons similar to a {conga line[1]}. Sometimes
      used figuratively or humorously.
      [PJC]