Cê é louco cachoeira is a slang expression from Brazil, where cachoeira is used here as a playful nickname rather than a literal waterfall reference. The clipped phrase circulated widely as a WhatsApp audio and in short form videos, where its misspellings like se loko cachoeira and ce e loko cachoeira helped it spread as a searchable meme. Its popularity comes from its versatility as a quick reaction to stunts, pranks, sports highlights and everyday absurdity, and it remains a staple in Brazilian meme edits and soundboards.