Arrasou comes from the verb arrasar, which means to devastate, destroy, or crush. It's a strong and evocative word that conveys intense emotional impact.
In the context of the song, the singer uses it to describe the profound pain and emotional destruction caused by a past love, singing "Tira esse golpe que me arrasou" (Take away this blow that crushed me). It perfectly captures the feeling of being utterly heartbroken and overwhelmed.
Ever been so desperate to get over someone that you ask your new crush to help you do it? That's exactly what's happening in "Tira Ela De Mim," which translates to "Take Her From Me." The singer is completely heartbroken after a "falso amor" (false love) and he's not being subtle about how he wants to move on. He directly asks a new person to help erase the past, pleading with them to "Tira a lembrança que ela deixou" (Take away the memory she left) and the "vazio que em mim ficou" (emptiness that stayed in me).
His method for getting over his ex is pretty bold. He asks this new person to physically and emotionally replace the old memories. He tells them, "Beija minha boca que ela beijou" (Kiss my mouth that she kissed), which is a very direct way of saying, "Help me forget her by being better!" He believes there's always room for a new love and that happiness is the ultimate goal. It's a song about using a new flame to put out an old one, and he's not wasting any time.