To have sex in water. To have sex in a pool, jacuzzi, hot tub, shower, bathtub, ocean, or other body of water.

When you drop a piece of technology in water (ipod, cell phone, etc) and no matter how hard you try to save it, it is damaged beyond repair and since no company will replace a water damaged piece of technology you're pretty much screwed.

The act of shoving a pipe a girls ass and leting the water so it's job

When your custom water cooled PC build leaks, and frys your components.