tubing noun4 •Tubes, considered as a group. •A length of tube, or a system of tubes. •Riding down a river on an inner tube recreationally.Enticed by boozy tubing experiences, throngs of twentysomething backpackers cemented its spot on south-east Asia’s famed backpacker trail. — 2024 •Tobogganing down a snowy slope or toboggan run on an inner tube. formstubings