1. a ball of fur, especially one coughed up by a cat or other animal
Usage: common in veterinary and pet care contexts
2. a person or character regarded as cute or cuddly, especially in fan communities
Usage: informal; often used affectionately in online communities and fandom

Examples

• The cat coughed up a furball on the carpet.
• My kitten has been having trouble with furballs lately.
• The vet recommended a special diet to help prevent furballs.
• Fans of the animated series call the main character an adorable furball.
• She's such a furball in that costume!