Anime rubber ball ecchi sound effect

Hi everybody,

I've spent quite some time trying to find that funny rubbery sound effect that plays in quite a few anime when large boobs are shown/jiggling.

Here is what I'm talking about: http://www.youtube.com/watch?v=7RkDnJlFQLA#t=1m14s.

Does anybody have more info on that? What makes that sound, what is the sound called, and most importantly, where can I find it?:confused:

Cheers!