Source : Webster's Revised Unabridged Dictionary (1913)

Logrolling \Log"roll`ing\, n.
   1. (Logging) The act or process of rolling logs from the
      place where they were felled to the stream which floats
      them to the sawmill or to market. In this labor
      neighboring camps of loggers combine to assist each other
      in turn. --Longfellow. [U.S.]

   2. Hence: A combining to assist another in consideration of
      receiving assistance in return; -- sometimes used of a
      disreputable mode of accomplishing political schemes or
      ends. [Cant, U.S.]

Source : WordNet®

logrolling
     n 1: act of exchanging favors for mutual gain; especially trading
          of influence or votes among legislators to gain passage
          of certain projects
     2: rotating a log rapidly in the water (as a competitive sport)
        [syn: {birling}]