Wiktionary
ruffle up
vb. 1 (context transitive English) To disturb the smoothness of. 2 (context transitive English) To destroy or ruin the arrangement or order of; disarrange
WordNet
Usage examples of "ruffle up".
Puckering up his face though smiling, and showing his short strong teeth, he began with stubby fingers of both hands to ruffle up his thick tangled black hair.
Shelley hated the unexpected cold, and he secreted himself on the floor in front of the passenger seat, crossly letting the hot air from the heater ruffle up his fur.
He walked through into the connecting office and resisted the impulse to ruffle up the inviting nape of Mary Goodnight's golden neck.