The phrase comes from everyday Brazilian Portuguese slang, where 'arrepiar' means to get goosebumps and 'todinho' is stretched to 'todin' for comic effect. Clips using the line spread on Brazilian social media and messaging apps as a ready-made reaction for anything that causes chills, from scary videos to surprising sports highlights. Its appeal is the mix of sincere shock and exaggeration, which lets creators reuse it in gaming, football and horror edits without needing extra context or subtitles for Portuguese-speaking audiences.