My keys have 'gone walkabout'. [='gone missing'; I can't find my keys]
Many people gathered to meet the Queen during her 'walkabout'.
an Aborigine who has 'gone walkabout'
(..) You know, Mom, all the glass seems to be on the outside. Plus, here's your little statue... If anything, someone was trying to break out. Where is Oscar? Well, he's on his walkabout or pilgrimage. He calls it a quest to recharge his chi. I call it an excuse for him... to score his pot (..)2004 TvShow: Arrested Development Title: Afternoon Delight Season: 2 Episode 6