The phrase "Sigma Boy x Brainrot Pirates Wrath of the Kraken" is a combination of internet slang and a reference to a viral song. "Sigma Boy" refers to the viral song by Betsy and Maria, where "Sigma" is used as slang for "cool" or "alpha". "Brainrot" describes the low-quality, often addictive internet content that can result from excessive social media consumption. The "Pirates Wrath of the Kraken" part is likely a humorous or nonsensical addition, referencing a pirate theme and a mythical sea monster.