Nasty Jacuzzi

When you ejaculate into a belly button (your own or someone else's) and then another person uses a straw to blow bubbles into it, hence a tiny nasty jacuzzi.

Now, if they drink it, well that's a whole new thing.

-Dude, Barbara and I did a Nasty Jacuzzi yesterday.
-WOAH, Who made the bubbles?
-I'd never tell.