Cule' is a colloquial and somewhat informal term, a shortened form of "culero" or "culebra" depending on the region, but in this context, it's used as an intensifier or a slang term for "a lot of" or "really."
In the song, Nicky Jam uses it in phrases like "Me tienen con culé mala fama" (They give me a lot of bad fame) and "Pa' que me salga con cule' rara'" (So that I come out with really weird ones). It adds a casual, street-smart flavor to the lyrics, making it an interesting word for learners to understand how Spanish is spoken informally.
In "Ta' Bien," Nicky Jam and Beele sing about a passionate and complicated connection. The song is a direct message to a woman who seems hesitant to commit, maybe because she's been hurt before. The singer tries to reassure her, saying, "Te han herido mil veces, conmigo no va a pasar" (You've been hurt a thousand times, it won't happen with me). However, he's not going to beg her to stay, telling her it's her decision.
The main message is one of confidence and inevitability. The title, which means "It's Okay," comes from the chorus where the singer says, "Sí, está bien / Di que no me quieres ver" (Yeah, it's okay / Say you don't want to see me). He's so sure of their intense physical and emotional connection that he knows she'll be back to repeat what they did "ayer" (yesterday). The lyrics describe an undeniable attraction, a feeling that they won't be able to resist each other for long, because as he says, "Tus besos y mis besos se extrañan" (Your kisses and my kisses miss each other).