Sourpuss is slang for a grouchy, bad tempered or sullen person.noun
A pouty child who is sullen because he did not get his own way is an example of a sourpuss.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Slang a person who has a gloomy or disagreeable expression or nature
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A habitually gloomy or sullen person.
Origin: sour + puss2.