Culero is a strong, informal Spanish slang term that literally refers to someone who is an "asshole" or a "jerk." It's a very common insult in many Spanish-speaking countries.
In this song, the singer uses it directly when he says, "Que te llenes la boca diciendo que soy un culero" (That you fill your mouth saying I'm an asshole). It highlights the raw emotion and conflict in the relationship, making it a memorable and impactful word that reveals the song's intense tone.
Calle 24's "YA ESTUVO BUENO" is a blunt, no-holds-barred breakup anthem that perfectly captures that moment when you've just had enough. Our singer is at his wit's end with a relationship that's gone sour. He's tired of the drama, the arguments, and the feeling of being taken for a fool. He sings, "Ya estuvo bueno que me esté viendo la cara de pendejo" [I've had enough of you making a fool out of me], making it clear he's done with the games.
Even though he admits she's "bien mamacita" [really hot] and that's why he still cares for her, he's reached his breaking point. He's fed up with her talking trash about him to his friends and ruining his good time, singing, "Que le hables a mi compas, que me amargues la party" [You talk to my friends, you ruin my party]. It's a relatable feeling of being stuck in a toxic cycle, where despite the attraction, the constant conflict has finally pushed him to say, "Ya no queda nada" [There's nothing left]. This song is all about drawing a line in the sand and choosing your peace over a chaotic love.