The Slip 'n Slide is a toy manufactured by Wham-O for use on lawns in the summer.
The toy is a long sheet of thin plastic, flanked lengthwise on one side by a heat-sealed tubular fold. The tube can be attached to any ordinary garden hose. Water runs through the tube and out small perforations, spraying onto the sliding surface. The Slip 'n Slide then becomes very slippery, enabling users to dive onto the plastic and slide the length of the sheet. Household materials such as dish soap or oil can also be used to reduce friction on the sheet. _Wikipedia