monkey business

American  

noun

1. frivolous or mischievous behavior.

2. improper or underhanded conduct; trickery.

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monkey business British  

noun

1. informal  mischievous, suspect, dishonest, or meddlesome behaviour or acts

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monkey business Idioms  

1. Silly, mischievous, or deceitful conduct, as in The teacher told the children to cut out the monkey business and get to work, or I don't trust that lawyer—there's some monkey business going on. This expression transfers the tricks of monkeys to human behavior. [Late 1800s]

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Etymology

Origin of monkey business

An Americanism dating back to 1880–85

Example Sentences

California Highway Patrol officers were floored by the ‘next level monkey business’ they discovered inside a speeding Rolls-Royce Ghost in Madera County on Monday night.

From Los Angeles Times

Cola spoke to Salon about her extensive work, her comedy career and what monkey business she gets up to in "The Tiger's Apprentice."

From Salon

“That was more than enough monkey business for us,” the department said in a post on X, formerly known as Twitter, to announce Momo’s capture.

From Seattle Times

Ron Kaufman, a McDaniel supporter and longtime RNC member from Massachusetts, said it is rare for members to walk away from public endorsements, though there is always room for some monkey business.

From Washington Times

That focus leaves Picasso in slight shadow, gives Braque his fair due and crowns a new champion of media monkey business and painterly legerdemain.

From New York Times