muss up

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muss up

To cause something to become disheveled or untidy, especially one's hair. A noun or pronoun can be used between "muss" and "up." I just spent an hour getting my hair exactly how I want it, so don't go mussing it up like that! Please don't muss up your hair before you get your pictures taken for school.
See also: up

muss someone or something up

to put someone or something into disarray. Don't muss me up! You mussed up my hair. I'm afraid I mussed myself up a little.
See also: up