Source : WordNet®

yap
     n : informal terms for the mouth [syn: {trap}, {cakehole}, {hole},
          {maw}, {gob}]
     v : bark in a high-pitched tone; "the puppies yelped" [syn: {yelp},
          {yip}]
     [also: {yapping}, {yapped}]

yapping
     See {yap}