Cérébro is a direct reference to Cerebro, the powerful mind-amplifying device used by Professor X in the X-Men comics and movies.
In the song, the artist says, "J'me fais cer-us' dans le Cérébro," which is a play on words. "Cer-us'" is slang for being 'used' or 'taken advantage of'. The line implies that people are trying to exploit his mind or ideas, as if they're plugging into his brain like Professor X uses Cerebro to amplify his psychic abilities. It's a clever and unique pop culture reference that adds a layer of meaning to the lyrics.
"Playa Part. II" is Ateyaba's boastful sequel about living like a playboy. He raps about cognac, designer clothes, and running through women, bragging that he can take any man's girl without a second thought.
Most of the track is pure flex: fast cars, brand names, and a "gang" chant that comes back again and again like a chorus of backup. There's no real story here, just Ateyaba stacking up reasons why he's on top.