Bélico is a powerful adjective that literally means "warlike" or "bellicose." While not a common word in daily conversation, it's the key to understanding the vibe of this song and the entire musical genre it belongs to.
Fuerza Regida is a famous group in the corridos bélicos (warlike ballads) subgenre. When they sing "Bélico peligroso" (warlike and dangerous), they are embracing an aggressive, confrontational, and powerful persona that defines their music and style.
This song drops you right into the middle of a wild, dangerous party. Fuerza Regida describes a night at the club where everything is turned up to the maximum. The scene is chaotic, fueled by vodka and "ese polvo rosa que te aloca" (that pink powder that drives you crazy). The narrator lives a "vida peligrosa" (dangerous life), rolling with bodyguards and patrolling in huge trucks called "monstruos" with his face covered.
At the center of this chaos is a woman he compares to the comic book character Harley Quinn. She's described as "fancy" and a "fresa" (a preppy or posh girl), but she's anything but innocent. She's his partner in crime, a "Harley Quinn lista pa' guerra" (Harley Quinn ready for war) who even guards his illegal goods with machine guns. The lyrics are incredibly direct about the mix of danger and desire, painting a picture of a thrilling, high-stakes lifestyle where the party never stops.