Any member of the clade Simiiformes not also of the clade Hominoidea containing humans and apes, from which they are usually, but not universally, distinguished by smaller size, a tail, and cheek pouches.
User Defined Definitions
"one who is playfully mischievous"
"play around with or alter or falsify, usually secretively or dishonestly"
"do random, unplanned work or activities or spend time idly"