monkey

A primate, typically small, with a long tail, found in tropical regions.

"We saw a cheeky monkey at the zoo."

A mischievous person, especially a child, often used affectionately.

"Stop being a little monkey and tidy your room!"

To play or fiddle with something in a clumsy or mischievous way.

"Don't monkey with the electrical wiring."

An informal British term for a sum of five hundred pounds sterling.

"That old car sold for a monkey."