Wiggle rotate only in one direction and varying speed

Hello!

So I'm trying to anmate a tumbleweed rolling across the screen.

I guess the best way to do it is to use a wiggle, right.

I know how to wiggle, but every expression I've used for other types of wiggles, go back and forth.

In this case, I need it to rotate only in one direction, obviously, right. And at varying speeds too.

Any expressions wizards able to help here?

Thanks in advance!