Crumple up
(Other definitions for scrunch that I've seen before include "Make a crushing noise" , "Loud noise of crushing" , "Crush, squeeze" , "Crumple" , "Sound of packing snow, say" .)
(Other definitions for wad that I've seen before include "Small mass of soft material" , "Bankroll; sandwich (slang)" , "Compact mass" , "Bundle of soft material or of banknotes" , "Lump or bundle of soft material" .)