Derived from their habit of foraging in dustbins for food, clothing and mating partners.
Can also be identified by foolish collective belief that Liverpool FC is a major footballing power. Can be found in large (10,000 or so) numbers at a local cesspit aka Anfailed. Although the number of meetings here tends to decline as the calendar progresses towards May,
Look at that Dipper (cue shell suit, face full of phlegm if speaking).