Chimba is a popular and versatile Colombian slang word that you'll hear all the time in Feid's music. It generally means "cool" or "awesome".
In this song, he sings "La pasamos chimba", which means "We had a great time". Learning this single word is a key to unlocking the modern, informal Spanish used in Medellín and much of today's reggaeton scene. Be careful with its use, though, as in some contexts it can be considered vulgar.
Feid kicks off this track by admitting he's not exactly a saint. He tells the girl, "He sido un hijueputa pero ojalá se me dé contigo" [I've been a son of a bitch but I hope it works out with you]. He's living a fast life of "Otra noche, otro problema, otro billete" [Another night, another problem, another dollar], but he's getting tired of it. He says he wants to retire from the scene and just come home to her, which he puts very directly: "Quiero llegar a casa, bebé, pa' desayunarte" [I want to get home, baby, to have you for breakfast].
What started as a one-weekend thing has turned into ten, and while he says they have a great time, he's very clear that "lo más chimba de esto es el sexo" [the best thing about this is the sex]. The song is full of these blunt, confident lines. He sees her story on Instagram and immediately wants to see her. He even brags about their private life, joking that if their videos ever leaked, they'd go viral. It's a song about a guy who's used to a wild lifestyle but is so into this girl that he's thinking about settling down, even if he's not quite ready for marriage just yet.