The phrase comes from Brazilian Portuguese slang, where merda is a swear word for a mess or trouble, so the line works as a blunt warning that something bad is returning. Its exact recording origin is not widely documented, which is typical for short voice clips that spread through soundboards, group chats and reposted meme edits. It stays popular because the meaning is clear from the delivery alone, and creators can apply it to returning villains, recurring bills, exes, homework, or any unwelcome comeback that needs an instant comic warning.