Monkey-business meaning

Silly, mischievous, or deceitful acts or behavior.
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Foolish, mischievous, or deceitful tricks or behavior.
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(US, slang) Wasting time, or effort, on some foolish project.
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An activity that is considered silly, or stupid, or time-wasting.
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(idiomatic) An activity that may be considered illegal, questionable, or a vice, but not felonious.
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