Abolengo refers to noble lineage or ancestry, suggesting a privileged family background or inherited social status. It is a more formal, old-fashioned word than simply saying "family" or "roots."
The song says "Y todo eso me ha costado porque no soy de abolengo" (And all of this has cost me because I'm not from a noble family), using abolengo to contrast humble origins with the demands of love or ambition.
Grupo Marca Registrada's "El Inocente" is a corrido that refuses to pick a side of its own narrator. He opens by offering up his own story — "¿Quieren que cuente mi historia? Con gusto yo se las cuento" ["Do you want me to hear my story? Gladly, I'll tell it to you"] — then spends the song describing a life built from nothing after moving to the city, where he drinks and smokes without calling himself an addict and shrugs off being "tratan como basura" ["treated like trash"] by recycling himself. The song's turn is "Pero también muy culero, todo depende de la historia" ["But also a real jerk, it all depends on the story"] — he's not claiming innocence, just context.
He traces his edge to work rather than money he was handed: "Yo no soy hijo de papi, me esforcé por lo que tengo" ["I'm no daddy's boy, I earned what I have"]. The closing verses turn on the people around him, who smile to his face and stab him in the back, landing on "Aquí todo es competencia y te chingan si haces feria" ["Here everything is competition, and they screw you over the moment you make money"] — a corrido about staying standing once everyone else has picked a side.