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.
This song is a classic Corrido Tumbado story about being the other man, or the "Sancho." The singer is talking directly to a woman who is already in a relationship, telling her to pack her bags for a secret trip. He's already called the private jet pilot and tells her, "Ya dile al tonto que ya te vas" (Tell that fool you're leaving). He's rich, a little arrogant, and promises her a wild time, flying to places like Ibiza and London. He loves that she's a "bandida" (bandit) and good at lying to her boyfriend, and he's not shy about what he wants, with super direct lines about their plans for the private jet.
Even with all the flexing about his money and private planes, he claims it wasn't the material things that won her over. He says, "Los detalles enamoraron a mi niña" (The details made my girl fall in love). But he also admits he's a player, warning her, "Mujeriego y coqueto, tengo mil amores" (A womanizer and a flirt, I have a thousand loves). He's basically telling her that if she wants to be with him, she has to accept his lifestyle and the rumors that come with it. It's a bold and confident song about a forbidden romance fueled by money, luxury, and excitement.