Opa and e ae are everyday Brazilian Portuguese greetings, and vei is informal slang for a friend, similar to dude or man. Short shouted greetings like this one circulate as shareable voice memes because the phrasing is familiar even without any context, while the long drawn out opening makes it recognisable in the first second. It is used across edits, group chats and soundboards as a quick hello, an entrance cue or a playful interruption, especially when a normal greeting would feel too flat or polite for the joke.