(informal, intransitive) To do random unplanned work or spend time idly.
Stop mucking about and get on with your work!
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(informal, intransitive) To attempt to do something with a piece of equipment without understanding how it works.
Don't muck about with the video machine, or you might break it.
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(informal, intransitive, British, Australia) To be playful; full of fun and high spirits; to treat a situation unseriously.
It was only a joke. We were only mucking about.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.