DogDay is a character from the horror game Poppy Playtime, where the smiling critters became widely shared online through fan edits, gameplay clips and short-form videos. This short yell circulates mainly as a reaction sound, passed between meme pages and editors who reuse it to mark an unlucky or embarrassing moment. Its appeal is its simplicity: a single frustrated cry needs no context to be understood. That instant readability has kept it in rotation long after the first clips featuring DogDay began spreading.