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