1. petty or trivial misbehavior; minor misconduct or foolishness
Usage: informal; chiefly North American
2. a minor or imaginary offense used as a pretext for arrest or harassment
Usage: slang; law enforcement context

Examples

• The kids were caught up in some mopery at the mall—nothing serious, just goofing around.
• He dismissed the charges as mopery, claiming the police were just looking for an excuse to stop him.
• Their mopery during class earned them a warning from the teacher.
• The officer cited him for mopery rather than pursuing a more serious charge.
• That kind of mopery is typical teenage behavior.