The phrase comes from Brazilian Portuguese slang shared in short meme audios, where Willmutt is presented chanting pula pula in a teasing, sing-song way. Clips like this spread through WhatsApp groups and soundboards because the line is easy to understand even without context and works as a standalone punchline. Its popularity comes from the repetition and the word bobo, a mild insult meaning silly or foolish, which keeps the tone playful rather than harsh. It remains a go-to reaction for hyper, bouncy or clumsy moments.