What does waterproof mean exactly

In this case waterproof means that water won't damage it. If it gets wet it's ok, but something like in shower wet.
I'd not advice you to submerge it, esp don't get the charging port wet...that can make your toy die! Reply

Definitely do not submerge in water! Basically this means that the toy is built to withstand some incidental wetness (like in a shower) and washing- but when washing in water be careful to avoid soaking the charging end. Reply

Actually the charge port of this has nothing exposed at all, it charges from the two surfaces resting against each other rather than plugging in like other rechargables. I haven't brought mine in the tub but it has been in the shower and been washed all over under warm running water with no problems what so ever. Reply

Submerging is fine with the Sinnflut toys. I have the Intensity, and it works great in the water. Nothing is exposed for the water to harm as the charge connectors are completely covered. Like Lynx Lady stated, nothing is exposed on this toy. My Sinnflut is my favorite tub toy because no water ever gets inside of it anywhere. Other "waterproof" toys I have do leak some water in, but this one does not. Reply