1. people who behave in an extremely wild or violent way
Usage: informal
2. people who are extremely enthusiastic about something
Usage: informal

Examples

• The drivers on that highway are complete maniacs.
• Those maniacs drove through the red light without stopping.
• Soccer maniacs painted their faces and cheered loudly.
• The fitness maniacs at the gym work out for hours every day.
• Shopping maniacs lined up outside the store before dawn.
• These video game maniacs play until three in the morning.