Mujeriego is a popular Spanish word for a "womanizer" or "player". It's a key term for understanding the persona in this song and a common theme in Regional Mexican music.
In the lyrics, the singer proudly declares, "Mujeriego y coqueto, tengo mil amores" (Womanizer and flirty, I have a thousand loves). This single word powerfully establishes his confident, ladies' man character, who warns his love interest that she'll have to put up with rumors if she wants to be with him.
In Mexican slang, a sancho is the secret side lover, and Fuerza Regida leans completely into that role here. The singer is telling a woman to pack her bags immediately—"Mi niña alista tu maleta ahorita" (My girl, pack your suitcase right now)—and ditch her actual partner ("Ya dile al tonto que ya te vas" [Tell that fool you're leaving already]). He has a private jet ready to fly to Ibiza and London, mixing luxury flexes with completely blunt hookups mid-flight. He knows she is taken and good at lying ("Cabrona, buena pa' mentiras" [Badass girl, good at telling lies]), but he loves the thrill of it anyway.
The track is packed with everyday Mexican slang. When he says "que no lo sepa tu güey" (don't let your guy find out), güey is the common slang term for a dude or boyfriend. He also throws around "sin pedos" (no problem / without drama) and tells her to pick a fight with her man ("peléate con tu güey") just to create an excuse to leave. He admits straight up that he is a player with thousands of lovers ("Mujeriego y coqueto, tengo mil amores" [A womanizer and a flirt, I have a thousand loves]), warning her that if she wants to be with him, she just has to deal with the rumors and keep cool ("Nomás no te me aloques" [Just don't go crazy on me]).