monkey

Noun

• one who is playfully mischievous

• any of various long-tailed primates (excluding the prosimians)

Verb

• do random, unplanned work or activities or spend time idly
  • The old lady is usually mucking about in her little house
    

• play around with or alter or falsify, usually secretively or dishonestly
  • Someone tampered with the documents on my desk
    
  • The reporter fiddle with the facts
    

Related words

• Synonyms: 
  imp , scamp , rascal , rapscallion , scalawag , scallywag , putter , mess around , potter , tinker , monkey around , muck about , muck around , tamper , fiddle