- Ugh is defined as a way to express disgust or horror.
When you walk into a room that is absolutely filthy and dirty, this is an example of when you might say "ugh."
ugh definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
used to express disgust, horror, etc.
ugh definition by American Heritage Dictionary
Used to express horror, disgust, or repugnance.