Definition & Meaning of "sourpuss"in English

What is the origin of the term "sourpuss" and how is it used?

"Sourpuss" is a slang term for a person who is habitually grumpy, gloomy, or difficult to please. It likely emerged in English in the late 19th to early 20th century, combining "sour" (evoking bitterness or unpleasantness) with "puss" (a familiar word for face, often used to refer to a person). The term highlights someone whose mood or expression is consistently displeased or negative. It is mildly derogatory, usually lighthearted or teasing, and used in informal contexts rather than as a serious insult.