Amiwitos de iutub comes from Spanish internet slang where amiguitos, meaning little friends, is intentionally misspelled and pronounced in a cute, childish way. The iutub spelling mirrors how the word sounds when said quickly, which is why the single search term iutub leads people to this clip. Short greeting sounds like this spread on soundboards and in edits because they work out of context, signalling a friendly, playful start without needing any setup or explanation from the original video.