Wiktionary
vb. To muck about.
WordNet
v. do random, unplanned work or activities or spend time idly; "The old lady is usually mucking about in her little house" [syn: putter, mess around, potter, tinker, monkey, monkey around, muck about]
Usage examples of "muck around".
Nothing had been done to preserve the city's defences and now the muck around the perimeters was as effective a protection as any wall.
Baresmanas was sent here by Khusrau to warn us not to muck around in the mess.
I asked her about this one and she made me take over the whole amaranth testing process so I wouldn't have time to muck around in the river.
When I was thirteen I used to climb out of the window and go and muck around with the boy next door.
And if you muck around in philosophy you'll find yourself, soon enough, mucking around with such risky stuff as the nature of God.
Playing the high and mighty lady muck-a-muck around here is going to get you nowhere, he blustered.