Coro literally means "chorus", like the part of a song that repeats. However, in Dominican slang, the phrase hacer coro means "to hang out", "to join in", or "to go along with the group".
In this bachata track, Dominican artist El Alfa sings, "A mis amigos en la calle no les hago coro", which means "I don't hang out with my friends on the street". He's expressing that he's so consumed by thoughts of his love interest that he's ignoring his friends and his social life, making this a fantastic and authentic piece of slang to learn.
This song is a total earworm, but the lyrics are actually pretty desperate! Camilo kicks things off with a classic breakup image: "El lado de tu cama que estaba caliente se está congelando" (The side of your bed that was warm is now freezing). He's alone and miserable, admitting that looking at her photos on his phone is "torturando" (torturing) him. He's not trying to move on; he directly asks her, "¿quién te dijo esa mentira?" (who told you that lie?) that he's forgotten her.
The whole song is basically him begging for an explanation. The chorus is just a series of questions for his ex: "Dime por qué te fuiste, dímelo, bebé" (Tell me why you left, tell me, baby) and "¿Por qué no me llamas? ¿Es que no me extrañas?" (Why don't you call me? Don't you miss me?). Then El Alfa jumps in and doubles down on the drama, telling her "Sin ti yo no vivo, mi amor, yo no como" (Without you I don't live, my love, I don't eat). It's a fun, upbeat bachata track about someone who is absolutely not okay after a breakup and wants answers right now.