Lawn water slide

Not to be confused with Water SlidesSlip and Slide, or commonly called under the abbreviation Slip 'n' Slide, are objects that are featured in The Sims 3: Generations and The Sims 4: Backyard Stuff. Slip and Slides are long plastic mats, usually with some decoration, that has water constantly sprays onto the mat and Sims can get a head start and slide down the mat to the end with style or, if they're bad at it, slip and fall.

The Sims 3
There are a total of two Slip and Slides in The Sims 3.

Base Game
Mascardo's Marine Misadventures is a Slip and Slide added in the base game via generations patch.

Generations
Ultimate Backyard Slide

Rib-it Rib-it Froggy McFrog Slide

The Sims 4
There is currently one upcoming Slip and Slide

The Sims 4: Backyard Stuff
There is an upcoming Slip and Slide as one of the gameplay feature.