The Collaborative International Dictionary of English v.0.48:
Tousle \Tou"sle\, v. t. [Freq. of touse. Cf.Tossle.] To put into disorder; to tumble; to touse. [Colloq.] [1913 Webster]WordNet (r) 3.0 (2006):
tousle v 1: disarrange or rumple; dishevel; "The strong wind tousled my hair" [syn: tousle, dishevel, tangle]