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muck up

(informal, AU, intransitive) To clown around; to have fun, often at the expense of others.

ˈmʌk ˈʌp52 viewsLast reviewed Jun 29, 2026+ Add a definition
🇦🇺 Australian & NZ slang
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Australia
#1·Apr 27, 2026AUS

(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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Australia
#2·Apr 27, 2026AUS

(informal, transitive, intransitive) To ruin unintentionally.

The terrorists have really mucked up our holiday plans.
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🇦🇺About Australian & NZ slang slang

Aussie and Kiwi vocabulary — bogan, daggy, brekkie, sheila, bach, jandals — the whole Antipodean lexicon, including outback dialect, surf and beach culture, and Sydney/Melbourne street slang.

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