Parto el queso literally means "I cut the cheese". However, this is a popular Spanish idiom where the person who 'cuts the cheese' is the one in charge, the boss.
In "SRT", Xavi uses this phrase to assert his authority and success, singing "A mí no me van a contar cómo es que corre el agua si yo parto el queso" (Don't tell me how things work if I'm the one who cuts the cheese). It's a memorable and visual way of saying, "I'm the one who runs the show here."
In "SRT", Mexican artist Xavi joins Fuerza Regida to celebrate hard-earned success while putting an ex firmly in her place. The title points right to the chorus: he is tearing down the road in an SRT (a high-performance Dodge muscle car), shouting that he feels like royalty: "Ahorita yo soy el rey" ("Right now I am the king"). The track is packed with bold Mexican street slang. When he brags, "A mí no me van a contar cómo es que corre el agua si yo parto el queso" ("No one's gonna tell me how water runs if I'm the one who cuts the cheese"), he uses a classic idiom meaning he is the boss calling the shots. He even shouts out Phoenix, Arizona with "la finiquera", a common slang term for the desert city.
The second verse turns sharply toward an ex who lost out on the good life. He stays up all night "haciendo feria a lo pendejo" ("making stupid amounts of money"), completely unbothered that she stopped calling because another attractive woman ("otro cuero") is already hitting his phone. He mocks her fake independence, telling her to lie to her friends and say she bought the Mercedes herself: "Di que te compraste sola la Mercedes". When he snaps, "Ya te la pelaste" ("You missed your chance / you blew it"), he shuts the door on any reunion for good.