- (US, slang) Wasting time, or effort, on some foolish project.
- An activity that is considered silly, or stupid, or time-wasting.
- (idiomatic) An activity that may be considered illegal, questionable, or a vice, but not felonious.
- Do your homework and forget about all this monkey business.
an activity that is considered silly, or stupid, or time-wasting (idiomatic)