Desgrama is a colloquial and somewhat vulgar term in Brazilian Portuguese, often used to express annoyance, frustration, or even a playful exasperation. It's similar to saying "damn thing" or "cursed thing" in English.
In the context of the song, the singer uses it to refer to an ex-partner, saying "Sabe a desgrama do meu ex?" (You know that damn ex of mine?). It adds a strong, informal, and emotionally charged tone, making it a memorable and intriguing word for learners.
"'Tô Pegando e Pegarei" is a duet where Márcia Fellipe and Tierry each take a turn roasting an ex.
Both verses follow the same shape: the ex was a "champion" at making them angry, dragging them through drama and driving them to drink. But this time, they say, they got over it just fine. The tag line "peguei, 'tô pegando e pegarei" plays on the verb "pegar," which in Brazilian slang means to hook up with someone. Loosely: "I got with someone, I'm getting with someone, and I'll keep getting with someone" - a boastful way of saying they've moved on and are thriving.
It's classic feminejo/sertanejo swagger: turning a bad breakup into a victory lap, with each singer cheering the other one on by name.