muss

 
Pronunciation: /mʌs/
informal, chiefly North American

verb

[with object]
  • make (someone’s hair or clothes) untidy or messy: the wind was mussing up his hair

noun

[usually in singular]
  • a state of disorder: no fuss, no muss—nothing left behind except a few little specks of dust

Derivatives

mussy

adjective

Origin:

mid 19th century (also as a noun in the sense 'disturbance or row'): apparently a variant of mess