To muss something, especially someone's hair, or to muss it up, means to make it untidy. He reached out and mussed my hair His clothes were all mussed up. to make something untidy, especially someone's hair (Probably from mess). no muss, no fuss used to say that something can be done easily and without problems - used humorously
A scramble, as when small objects are thrown down, to be taken by those who can seize them; a confused struggle