Fingiendo means "pretending" or "faking." It's a relatable word that captures a common human experience of putting on a brave face.
In the song, KAROL G repeatedly uses this word to describe how she's pretending to be happy and over her ex, even though she's still hurting deeply. She sings, "Pero to' el que me conoce bien sabe que estoy fingiendo" (But everyone who knows me well knows that I'm pretending), highlighting the emotional struggle behind her outward appearance.
Have you ever tried to look happy after a breakup, even when you're totally falling apart inside? That's exactly what KAROL G is singing about in "Si Lo Ven". She's going out more and posting on social media like she's having the time of her life, saying she's in her "mejor momento" [best moment]. But it's all an act. She admits that anyone who really knows her can see she's just pretending, and while she's "Por fuera sonriendo" [smiling on the outside], she's "Por dentro muriendo" [dying on the inside].
The whole song is a message to her friends. She's begging them, if they run into her ex, to lie for her. She wants them to say she's doing great and has completely moved on. But then she asks them, "Miéntanle, por favor" [Lie to him, please], because the truth is the opposite. She doesn't want him to know she still cries over him or that he still has control over her. It's a powerful look at the pride we try to keep after a relationship ends, even when we feel broken.