Wiktionary
rumple up
vb. (context idiomatic transitive English) to cause to become rumpled
Usage examples of "rumple up".
Now Chloris laughed, and quitted her queer embroidery in order to rumple up his hair.
When I wake up, I rumple up the top bed, I throw the nightgown on it sloppily and scatter the powder in the bathroom and so on.
But there's no one to snatch at them, like there used to be, and rumple up all the other sections of the paper in the process of extracting them.