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