carrier bag, plastic bag, tramp's suitcase,
A discarded plastic bag from the local off-license (liquor store) that has been caught in the breeze. Most commonly spotted floating down the estate roads of the industrial paradise that is Slough (pronounced as sl-ow) in the UK.
Person 1: "This high street is deserted."
Person 2: "Well the tramps were here at some point judging by the number of Slough Tumbleweeds floating around the place."