- Sourpuss is slang for a grouchy, bad tempered or sullen person.
A pouty child who is sullen because he did not get his own way is an example of a sourpuss.
sourpuss 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.
Slang a person who has a gloomy or disagreeable expression or nature
sourpuss definition by American Heritage Dictionary
A habitually gloomy or sullen person.
Origin: sour + puss2.