Chimba is one of the most popular slang words from Maluma's home country of Colombia. While its meaning can be very flexible depending on the context, in this song he uses it to mean 'awesome' or 'the best'.
He proudly sings, "Pero una chimba ser Antioqueño" (But it's awesome to be from Antioquia), expressing deep pride for his roots. Learning this single word is a fantastic key to understanding the real, everyday language you'll hear in modern Latin music.
This song is a straight-up love letter from Maluma to his home. He's not singing about a girl; he's singing about the pain of being away from his country, Colombia. He starts by telling his mom about a deep sadness he feels, saying, "Fui buscando fortuna y dejé mi pueblo" (I went looking for fortune and left my town). You can feel how much he misses the simple things, like hanging out with his friends, "mis parceros del barrio" (my buddies from the neighborhood), and the house where he grew up.
He gets really specific about his pride, connecting the colors of the Colombian flag to his own family with the line "Amarillo el sol, azul el cielo / Roja la sangre de mis abuelos" (Yellow the sun, blue the sky / Red the blood of my grandparents). He even gives a special shout-out to his home region, saying it's an honor to be Colombian, "Pero una chimba ser Antioqueño" (But it's awesome to be from Antioquia). The whole song builds to this repeated, desperate feeling: "Que estoy loco por volver" (That I'm crazy to return). It's a powerful look at how success can take you far away from the things that made you who you are.