Scrunch

Verb

 * 1) To crumple and squeeze to make more compact.
 * He scrunched the paper into a ball and threw it at the whistling girl.

Noun

 * 1) A crunching noise.

Thesaurus
abrade, atomize, beat, belch, blare, blat, bray, brecciate, burr, buzz, cackle, caw, champ, chaw, chew, chirr, chomp, chump, clang, clangor, clank, clash, comminute, contriturate, craunch, crimp, crimple, crinkle, croak, crumb, crumble, crump, crunch, crush, disintegrate, flour, fragment, grain, granulate, granulize, grate, grind, grind to powder, groan, growl, grumble, jangle, jar, levigate, mash, masticate, mill, munch, pestle, pound, powder, pulverize, rasp, reduce to powder, rimple, ruckle, ruminate, rumple, scranch, scrape, scratch, screw, shard, shred, smash, snarl, snore, squash, triturate, twang, wrinkle

Etymology
onomatopoeia, from the sound of crumpling a piece of paper

Translations

 * Danish: knase or mase