Túmbate el rollo is a very colloquial and expressive phrase that literally translates to "throw yourself the roll," but it's an idiomatic expression meaning "chill out," "relax," or "get over it."
In the context of the song, the singer is telling someone to stop being so uptight or to let go of their past grievances and expectations. It's a vivid and memorable phrase that captures a very specific, informal tone, making it interesting for learners to discover how Spanish uses such colorful expressions.
El Komander's "Túmbate el Rollo" is a blunt message to someone who has forgotten their roots. He's calling out a friend who used to be humble, someone he knew when they were both "en el arroyo" [in the creek], but who has now changed.
The singer reminds this person of their past, when they were entrusted with his parents' ranch. Now, with their "botas y sombreros" [boots and hats] and a "carro está muy perro" [a really cool car], they seem to have forgotten where they came from. He even pokes fun at their new look, saying, "no te mira nada mal con eso" [you don't look bad with that], but then quickly adds that their old friends and family are upset. It's a funny, direct song about staying true to yourself, even when you find success.