Rayitas is the diminutive of rayas, meaning 'lines' or 'stripes'. While it literally means 'little lines', in this song, it's used in a common idiomatic expression: "Bájele tres rayitas."
This phrase translates to "tone it down a bit" or "calm down." The singer uses it to tell someone who is being too demanding or aggressive to reduce their intensity, making it a colorful and culturally interesting phrase to learn.
Tired of mixed signals? Hijos De Barron and Luis Angel "El Flaco" have the perfect anthem for you. In "Y Si Se Quiere Ir," the singer is fed up with a partner who one day swears she can't live without him, and the next day is full of doubts. He's done playing games ("¿A qué estamos jugando?") and wants to get straight to the point.
This song is a powerful declaration of self-respect. The singer tells his partner that if she wants to leave, she should go—in fact, the light is green and the door is wide open ("La puerta está muy grande / La luz se puso en verde"). He makes it clear that he won't be disrespected ("A mà nadie me grita") and her departure won't cause him to lose any sleep. He even adds a warning: don't come back crying when you miss me, because by then, I will have already forgotten you.