Definitions

1. adjective

given to excessive and persistent barking, whining, or other noisy behavior, typically of a small dog

“The yappy neighbor’s dog kept waking the entire family up at night.”

2. noun

a small dog that barks or whines persistently

“The yappy terrier was a popular breed among local pet owners.”

3. verb

to bark or whine persistently, especially in a way that is annoying or excessive

“The little dog was yapping at the mailman again.”