yapper

plural yappers

1. slangA person's mouth, especially one that gossips or talks too much.

   Shut your yapper or I'll shut it for you!

2. One who yaps.

   I have to admit I would have a lot more tolerance for cell phone yappers on my one-hour train ride to and from work if they were actually learning — instead of yelling […]

   2007, Training, volume 44, numbers 1-10, page 6

   1 more example

   If you want your pack to be a deterrent against burglars or muggers, forget about small dogs, yappers though they be. Focus on the larger breeds, particularly working stock with strong instinctual drives.

   2004, Theresa Mancus, Who moved my bone?: a guide for multi-dog households, page 25

3. abbreviationellipsisinformalEllipsis of yapper dog

   If you’ve got a yapper dog, take him somewhere else.

   2011, Goodavage, Maria, The Dog Lover's Companion to California The Inside Scoop on Where to Take Your Dog, page 159

   Synonyms: yipper