Realengo is a fascinating word with a dual meaning: it can describe something ownerless or stray, like a dog with no home, but historically also referred to royal or crown owned land.
In the song, the artist raps "yo que soy un perro realengo" ("I'm just a stray dog"), using realengo to describe himself as independent and unattached, answering to no one.
"No Contesta" is Ele A El Dominio leaning hard into a breakup he won't admit is still eating him alive. The hook says it straight: he's not answering her calls anymore, he's out at the party, drinks in hand, surrounded by women, acting like the good life never skipped a beat.
Underneath the swagger, the coping is obvious. He's drowning the memory in champagne and cocaine, keeping a gun close, running through a rotation of women who don't come close to filling the gap she left. He even admits missing her mother, which lands harder than any of the tough talk around it.
That's the twist the chorus hides in plain sight: "no te voy a olvidar, de ti voy a escapar", he won't forget her, and he's trying to escape her anyway. The whole song is that contradiction on a loop, a guy convincing himself he's moved on while every verse proves he hasn't.