Noun:
1: monkey any of various long-tailed primates (excluding the prosimians)
2: imp, rapscallion, scamp, monkey, scallywag, scalawag, rascal one who is playfully mischievous
Verb:
1: tamper, fiddle, monkey 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"
2: mess around, putter, monkey, potter, muck around, tinker, monkey around, muck about do random, unplanned work or activities or spend time idly; "The old lady is usually mucking about in her little house"