1. a person or animal that chirps; something that makes a chirping sound
Usage: informal; often used to describe birds or insects
2. a cheerful or lively person
Usage: informal; colloquial

Examples

• The little chirper in the tree sang all morning long.
• She's such a chirper—always smiling and full of energy.
• The crickets are active chirpers during the summer nights.
• Even on difficult days, he remains a cheerful chirper.
• That bird is quite the chirper; it never seems to stop singing.