The song "Sigma Boy x Brainrot Pirates 2 | Extinct Italian Brainrot" likely refers to a mashup or remix that combines the popular song "Sigma Boy" with elements from the "Brainrot Pirates" genre, possibly including Italian-themed or brainrot-inducing content. "Sigma Boy" itself is a song by two young Russian artists, Betsy and Maria, that became a viral sensation. The "Brainrot Pirates" label suggests a playful, often nonsensical, and internet-meme-infused style. The "Extinct Italian" part could indicate a specific theme or source material within that style, potentially related to Italian culture or language that is now considered "extinct" in the context of the meme.