- yap
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1. n. the mouth.□ Shut your yap!□ You have a big yap, you know?2. in. to chatter; to gossip. D Who’s yapping so much in here?□ Did you just come here to yap?3. n. nonsense; gibberish.□ That’s just yap. Forget it. They mean no harm.□ That windbag can produce an enormous amount of yap.4. in. to empty one’s tomach; to vomit.□ Who yapped in the bushes?□ Ye gods, do I hear one of our guests yapping in the powder room?5. n. a naive person; a dupe.□ The poor yap was made a fool of.□ See if you can get that yap to bring over a left-handed monkey wrench.
Dictionary of American slang and colloquial expressions. 2015.