Aguacero translates to "downpour" or "heavy rain." It's a more evocative and less common word for rain than simply "lluvia."
In the song, the artist uses aguacero to paint a vivid picture of his humble beginnings, contrasting it with the idea of a cruise. He says, "Si es que había un aguacero, navegaba por la calle con la tola y el velero," implying that even in a heavy rain, he was out on the streets, hustling with his "tola y el velero" (which can be interpreted as slang for a gun and a car, or simply his means of getting by). This word adds a layer of grit and realism to his narrative.
Milo J and Morad's "LA TOLA Y EL VELERO" is a powerful look into growing up in tough circumstances and the choices that come with it. Milo J starts by telling us he "Nunca tuve pa' un crucero" [never had money for a cruise], but instead, he was navigating the streets "Con la tola y el velero" [with the gun and the sailboat] when it rained. This imagery immediately sets the scene of a hard life where survival is key.
His mother's wisdom, telling him "el dinero no valdría para nada si lo pones de primero" [money wouldn't be worth anything if you put it first], is a core theme. But Milo J admits he didn't listen, getting drawn into a world where he had to "En problemas a acostumbrarme" [get used to problems]. He calls himself a "Joseador antes que cantante" [hustler before a singer], showing that his past experiences shaped him. Even with success, he's still grounded, saying "Sé que un cero no va a cambiarme si Morón sigue conmigo" [I know a zero (a million) won't change me if Morón (his neighborhood/friend) is still with me]. It's a raw and honest reflection on loyalty, ambition, and the journey from the streets to where he is now, with Morad adding his own perspective on the struggles and triumphs.