What is a stinky slinky?

A stinky slinky is the nickname for a RV sewer hose. When emptying RV tanks an accordion-style hose is attached to the output port on the RV, with the other end being placed into a hole at a dump station. Levers are then pulled to empty the tanks: blank tank first (toilet contents), then gray tank after to remove any leftovers from when the black tank was emptied. Most people wear gloves when doing a tank dump. Given that the sewer hose is stretchy like a slinky, and removes toilet waste, the nickname “stinky slinky” is common.