Que onda is a common Mexican Spanish slang greeting similar to whats up, and perros is used here as slang for close friends rather than literal dogs. This stretched, shouted version spread through meme soundboards, TikTok edits and WhatsApp audio sharing, where short Spanish voice clips are reused as instant reactions. Its popularity comes from the exaggerated delivery and the long rolled ending, which makes it recognizable even without context and easy to drop into gaming, comedy and group chat videos.