turtle
n.— «A sewer is a slippery workplace. Water can move at the speed of oncoming traffic, even when it is not laden with tree branches, two-by-fours and the waste products known in the business as “turtles.”» —“Working in the Sewers Is a Dirty Job, but Someone’s Got to Win” by Ellen Barry New York Times May 9, 2007. (source: Double-Tongued Dictionary)
Further reading
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