three-D job n. an occupation or undertaking that is dirty, dangerous, and difficult (or demanding). (source: Double-Tongued Dictionary)
Further reading
She sells seashells by the seashore. Who is the she in this tongue twister? Some claim it’s the young Mary Anning, who went on to become a famous 19th-century British paleontologist. Dubious perhaps, but the story of her rise from seaside...
Wendy from Charlotte, North Carolina, was baffled when a co-worker asked, Are you ready to race for pinks? The phrase racing for pinks refers to participating in car races where the winner gets ownership of a car, the pinks referring to the pink...