The phrase comes from Brazilian Portuguese meme culture, where 'peitoral de tijolo' literally means a chest made of brick and 'peitoral empretrificado' jokes about a petrified thorax. Shared tags link it to the Fantastic Four, an easy connection to a rock-bodied hero with a stone chest. The clip spread as a short reusable reaction on soundboards and in edits, rather than as a full scene, and creators keep using it because the image is instantly clear even without context: a torso so hard it stops being muscle and becomes construction material.