The Cardi B track containing the lyrics "I do the Maybach on Monday, Ferrari Friday" is "Money Bag." The song is a swaggering rap performance built around boasts about luxury vehicles, designer fashion, money, and Cardi B's public persona.
"Money Bag" appears on Cardi B's debut studio album, "Invasion of Privacy," released in 2018. The track was produced by J. White Did It and Laquan Green, and its repeated title phrase functions as the song's central hook. The Monday-and-Friday line is part of the opening refrain, which then continues with references to Saturday, Plies, Beyoncé, and high-end possessions.
A common mix-up is confusing "Money Bag" with Cardi B's song "Money," a separate single released later in 2018. Both songs use wealth and luxury as major themes, but the quoted Maybach-and-Ferrari lyric belongs specifically to "Money Bag." The song helped reinforce the lavish, punchline-heavy style that became central to Cardi B's early mainstream success.