No messing Definition 1 of 2Pro Tip 1/3Work Focus Used to stress the importance of concentrating at a task without distractions. The library is a study zone — no messing when you're in here. Pro Tip 2/3Behavior Caution Often said by authority figures to maintain discipline or control in a situation. Remember kids, no messing around during the fire drill. Pro Tip 3/3Task Seriousness Emphasizes the need to approach a task with a serious attitude and proper conduct. We are on a tight schedule, so no messing about, please.