“Ко праите бе?” is informal Bulgarian speech, with “ко” and “праите” reflecting shortened conversational pronunciation. The phrase is commonly understood as a blunt, familiar version of “What are you doing?” The exact recording source and original speaker are not reliably documented, so it is best known through its use as an online reaction audio. Its questioning delivery and short runtime make it easy to reuse in meme videos, gaming moments, chat responses, and edits built around confusion or disbelief.