How do you pop the wake so you get slack?

What is the technique or process or whatever for creating slack in the rope when you pop the wake? I've seem some riders go up and float and the line's slackening off-- which must be a very nice thing to happen when you're trying a handle pass. How do you "pop" the wake so you get slack?

I was being taught the H/S 360 by my dad's friend,any way, what he said was to get your speed you need tward the wake, then when you are 5 feet from it, let offa your edge and pretend to jump into the back of the boat and look tward the wake, this will start your spin then pass the handel past the small of your back, easier to reach there if it does tighten back up

You dont want slack on the rope so you can pull the rope into the small of your back

To expand on what Daniel said, you pull on the rope to initiate a spin so you don't want slack when you leave the wake. By pulling the rope to your hip you create some slack which enables you to make the handle pass.