arremangado literally means to have your sleeves rolled up. In popular slang, especially within Regional Mexican music, it describes a personality type: a go-getter, a hustler who is proactive and always ready for action.
In the song, the singer says, "Bien sabes soy arremangado" (You know well I'm a go-getter). He uses the word to define his confident, hard-working persona, contrasting it with traditional romantic gestures like buying flowers.
Fuerza Regida gives us a look into a life of pure excess in "Brillarosa." The singer is completely focused on making money, saying he keeps working "pa' un chingo de feria generar" (to generate a ton of cash). This isn't just about wealth; it's about a specific kind of flashy, rockstar lifestyle. He warns a woman directly: "Un rockstar, niña, ten cuidado" (A rockstar, girl, be careful).
He's not subtle about what this lifestyle includes. He casually mentions "Mi esposa tiene el pelo negro y mi novia es una güera" (My wife has black hair and my girlfriend is a blonde). He's too busy to pick up his date, sending a driver instead: "No voy por ti, te mandé el chofer" (I'm not coming for you, I sent the chauffeur). The whole song is built around this blunt attitude and the luxury he can afford, like popping expensive pink champagne, which he calls "el champú que te compré" (the shampoo I bought you).