1. a mistake or error, especially one that causes problems
Usage: informal
2. a person who frequently makes mistakes or fails at things
Usage: informal

Examples

• The scheduling screwup caused three meetings to overlap.
• Don’t blame me for this screwup – it wasn’t my fault.
• The computer system screwup delayed all the flights.
• He’s such a screwup that nobody wants to work with him.
• One small screwup could ruin the entire project.
• The billing screwup resulted in angry customers calling all day.