Back-scratchers' activity

• Rotating a log rapidly in the water (as a competitive sport)
• Lumberjack's sport
• Act of exchanging favors for mutual gain
• Work toward the passage of some legislation by exchanging political favors such as trading votes

Wiktionary Word definitions in Wiktionary
n. 1 The rolling of logs. 2 A concerted effort to push forward mutually advantageous legislative agendas by combining two items, either or both of which might fail on its own, into a single bill that is more likely to pass. 3 Mutual recommendation of friends' ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also log-rolling , in the legislative vote-trading sense, 1823, American English, from the notion of neighbors on the frontier helping one another with the heavy work of clearing land and building cabins (as in phrase you roll my log and I'll roll yours ...

Wikipedia Word definitions in Wikipedia
Logrolling is trading of favors, especially in politics. Logrolling , log rolling , or log roll may also refer to: Logrolling (sport) , sport involving balancing on submerged wooden logs A stage of log driving , literal rolling of logs Logrolling (medicine) ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Logrolling \Log"roll`ing\, n. (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. ...