Eita porra is a common Brazilian Portuguese exclamation used online to react to surprise, embarrassment or something going wrong, roughly similar to an emphatic oh no in English. Clips built around short shouted phrases like this spread through meme pages, group chats and short video edits in Brazil, where a one second reaction can be reused in countless contexts. Adding the name Peter makes this version more specific and funnier when edited onto a character or friend with that name, which helps it work as an in-joke soundboard staple.