yap

intransitive verb yapped, yapping yap′·ping

1. to make a sharp, shrill bark or yelp
2. Slang to talk noisily and stupidly; jabber

Etymology: echoic

noun

1. a sharp, shrill bark or yelp
2. Slang noisy, stupid talk; jabber
3. Slang a crude, noisy, or contemptible person
4. Slang the mouth