Usually middle aged, bald (either naturally or by choice), heavily tattooed and overweight, yellowbacks like to smoke (invariably roll up’s), drink tea and shout- which is not usually necessary as their power tools will rarely be turned on.
Due to Health and safety legislation, it can take up to twenty yellowbacks to perform even the simplest of tasks such as turning round the “Stop” and “Go” signs or sitting in gritting lorries eating sausage rolls. Despite the unisex “Staff working at rear” warning signs on such vehicles, nobody has ever seen a female yellowback.
Phil: "It's the council's fault! They're too tight to pay the yellowbacks night wages!"