From yap +‎ -y.

• IPA^(key): /ˈjæ.pi/

• Audio (Southern England):

  (file)

• Rhymes: -æpi

yappy (comparative yappier, superlative yappiest)

1. Of a dog, yapping in an annoying manner.

   yappy puppy

2. Very talkative; talking foolishly or at length.