(informal, transitive, intransitive) To ruin unintentionally.
The terrorists have really mucked up our holiday plans.
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(informal, AU, intransitive) To clown around; to have fun, often at the expense of others.
That’s why they’re called the Founders? Yes, because it will be their job to repair a world that millennials have mucked up beyond repair.
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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.