Muck up

verb, slang

Definitions

Verb
  1. 1
    To ruin unintentionally. informal, intransitive, transitive

    "The terrorists have really mucked up our holiday plans."

  2. 2
    soil with mud, muck, or mire wordnet
  3. 3
    To clown around; to have fun, often at the expense of others. Australia, informal, intransitive

    "It's the last day of school and everyone is mucking up."

  4. 4
    make a mess of, destroy or ruin wordnet

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