Fotocopiadora literally translates to "photocopier". It's a fantastic example of modern slang that you won't typically find in a textbook.
In this reggaeton track, Yailin uses it as a creative insult, calling her rival a fotocopiadora to imply that she's just a cheap copy or an imitation. This word is a memorable way she asserts that she is the original—"la real soy yo" (I'm the real one)—making it a perfect term to understand the song's sassy and confrontational attitude.
This song is a direct and aggressive message from one woman to another. Yailin la Mas Viral isn't holding back; she's telling her rival that she's the one with her man. The lyrics are built around the incredibly blunt line, "Soy la perra de tu marío', que te lo tiene fundío'" (I'm your husband's bitch, who has him worn out).
Yailin positions herself as the original and the best, calling the other woman a "Fotocopiadora" (Photocopier) and claiming she is "la real soy yo" (the real one). She taunts her rival by saying she is living the life the other woman only dreamed of. The whole song is a challenge, full of Dominican slang and a confrontational energy that dares anyone to step to her.