The phrase comes from Brazilian Portuguese slang, where 'guri' is a southern Brazilian word for a boy and 'feio do cão' is a blunt, colloquial way of saying extremely ugly. As a standalone clip, it circulates mainly through meme soundboards and short-form reaction videos, where Portuguese-speaking creators reuse it as a quick, quotable roast. Its appeal is the contrast between the casual opening 'eita' and the exaggerated insult that follows, which makes it easy to drop over an unexpected reveal without needing any translation or setup.