Bélico literally means "warlike" or "bellicose", but it has a specific cultural meaning in modern regional Mexican music. It's used to describe an aggressive, confident, and unapologetic attitude, often associated with the corridos bélicos subgenre.
In the song, the artist says, "Ay, mamá, bélico, pero no tanto, mija" (Oh, mama, warlike, but not so much, my dear). He's playfully acknowledging this tough persona while also softening it, showing a more tender side in the context of romance. It's a super interesting and trendy word to understand this popular style of music.
This song is a super direct message to a girl who's with the wrong guy. Tito Double P is playing the part of a confident guy who knows this girl wants to be with him, even if her mom disapproves. He's not shy about it at all, driving past her house and quemando llanta [burning rubber] to get her attention. He knows she goes to parties with another man, but he also knows él no te gusta pa' nada [you don't like him at all].
His solution is simple: she should just leave the other guy and run away with him. He makes his case by pointing out that he can give her what the other guy only promises, like a designer bag. He tells her straight up to tell everyone that he's the one who makes her happy at night. The whole song is basically him saying, Bebé, no tengas miedo de escaparte conmigo [Baby, don't be afraid to escape with me]. It's a bold and romantic gesture, all about convincing her to choose the exciting life he offers.