sourpuss /ˈsaʊə(ɹ)ˌpʊs/noun 1verb 1forms 3 noun1 •(informal) A person who is habitually gloomy, sullen or miserable; a grouch; a scowling person.They butt heads sometimes because Jenna can be pretty selfish and tone-deaf, and Jeordie can be a little bit of a sourpuss. — 2025 verb1 •To make a gloomy, sullen or miserable facial expression; to scowl.“Oh, stop your sourpussing. We got what you needed.” — 2006 formssourpussed · sourpussing · sourpusses