Consiento comes from the verb consentir and means "I spoil" or "I pamper". It's a fantastic word to describe showing affection through lavish treatment and gifts.
In the song, the singer expresses his frustration by listing all the ways he pampers his partner: "Si te consiento con perros, con playas, con antros" (If I spoil you with dogs, with beaches, with clubs). This word perfectly captures the song's theme of a troubled relationship where grand gestures of affection clash with constant arguments.
This song is one big, dramatic plea from a guy who is completely fed up with his girlfriend. He's at his breaking point, singing, "Ya ni te entiendo, la neta, ya no te soporto" (I don't even get you, honestly, I can't stand you anymore). He doesn't understand why they're always fighting when he spoils her with everything from puppies to parties: "te consiento con perros, con playas, con antros" (I spoil you with dogs, with beaches, with clubs). He insists the problems are just "chismes" (gossip) and that she needs to see the truth. Despite his frustration, he's still in love, listing the things he likes about her with a hilarious mix of romance and bluntness: "Tu culo es uno y verte sonreír" (Your ass is one and seeing you smile).
His solution is where the title, "Volver Al Futuro" (Back to the Future), comes in. He wishes he could time travel to the moment they first met. His plan? "Deseo viajar al pasado y besarte con fuerzas / Pa' que en el futuro no existan las pinches peleas" (I wish to travel to the past and kiss you forcefully / So that in the future the f*cking fights don't exist). It's a wild idea, but it shows how much he wants to fix things. He's not giving up, confidently telling her, "En el futuro tu esposo soy yo" (In the future, I am your husband). It's a messy, passionate, and kind of funny look at a relationship on the edge.