Yum-yum is defined as something said to show that something looks or tastes very good.interjection
What is said when eating an amazing chocolate cake is an example of yum-yum.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Variant of yum
Origin: echoic: see yummy
Used by arrangement with John Wiley & Sons, Inc.