go walkabout

Definition

Slang

  • verb to daydream, lose concentration. The term derives from the Australian Aboriginal practice of leaving the community to go into the bush on a mystical quest (when they are said to ‘go walkabout’). It was applied by journalists to the tendency of the tennis player, Evonne Goolagong, to allow her concentration to slip during matches and now is applied to any sort of aberrant mental behaviour.
http://www.dictionarycentral.com/definition/go-walkabout.html