Medo tremendo, Portuguese for tremendous fear, circulates mainly through Portuguese-speaking meme communities, where short voice-note style clips get ripped from chats and reposted onto soundboards. Unlike a scream meme built on volume alone, its comedy comes from the trembling, quivery delivery that makes panic sound ridiculous instead of scary. Its exact origin is not well documented, but like many viral meme sounds it spread through short-form edits and WhatsApp audio chains, and creators still reach for it whenever a scene needs an instant, recognisable burst of fake fear.