The phrase comes from everyday Brazilian Portuguese, where memo is a relaxed pronunciation of mesmo, used to stress disbelief when confirming surprising information. No specific original recording, creator or year is confidently known for this four second clip, so it circulates mainly as a detached reaction audio rather than as a scene people quote from a film or show. It spread through short video edits, group chats and soundboards, especially in jokes about relationships and gossip. Its continued use comes from its brevity and tone, which communicate suspicion and surprise without needing any setup or explanation.