The Collaborative International Dictionary of English v.0.48:

Rumple \Rum"ple\, v. t. & i. [imp. & p. p. Rumpled p. pr. &
   vb. n. Rumpling.] [Cf. rimple, and D. rimpelen to wrinkle,
   rompelig rough, uneven, G. r["u]mpfen to wrinkle, MHG.
   r["u]mphen, OHG. rimpfan, Gr. "ra`mfos the crooked beak of
   birds of prey, ? to roam.]
   To make uneven; to form into irregular inequalities; to
   wrinkle; to crumple; as, to rumple an apron or a cravat.
   [1913 Webster]

         They would not give a dog's ear of their most rumpled
         and ragged Scotch paper for twenty of your fairest
         assignats.                               --Burke.
   [1913 Webster]