Bienvenido wey combines the standard Spanish welcome bienvenido with wey, a very common Mexican slang term used between friends. Short Spanish greeting clips like this circulate widely in Latin American group chats, gaming lobbies and short video edits, where a familiar phrase can do the work of a joke without any setup. Its appeal comes from that mix of hospitality and informality, so it gets reused whenever someone arrives, rejoins or is introduced, especially in Spanish speaking meme culture online.