Definition of "monkey business" in English

Noun

1. Activity that is mischievous, stupid, or time-wasting. .mw-parser-output .defdate{font-size:smaller}

   • Stop all this monkey business and do your homework!

2. Activity that is morally questionable or even mildly illegal.

   • She wondered what sort of monkey business her neighbour was up to, sneaking out of his house at 1:00 am.