La regué is a popular Mexican slang phrase that means "I messed up" or "I blew it". It's a super common and natural way to admit you've made a big mistake.
The verb regar literally means "to water," as in watering a plant. The expression likely comes from the idea of spilling water and making a mess, a perfect metaphor for messing things up!
In "TE ODIO!", the singer says, "Contigo neta que la regué" ("With you, I really messed up"), expressing his raw regret over getting into a relationship that ended in heartbreak.
Ever been so angry at an ex that you make a late-night call just to insult their new partner? That is exactly how Eslabon Armado kicks off "TE ODIO!". He rings her up late with a blunt reality check: "¿Por qué lo que escogiste a él? Neta que bajaste de nivel" ("Why did you choose him? Honestly, you lowered your standards"). In Mexican slang, neta means "truth" or "honestly," and he doubles down on the casual phrasing with "contigo neta que la regué" ("with you, honestly, I messed up"), where la regué comes from the everyday idiom regarla (to mess up or drop the ball). He admits she is pretty on the outside, but calls her out for being rotten inside, throwing in a dramatic "sin ofenderte, eres una desgraciada" ("no offense, you're a scoundrel").
The track swings wildly between deep hurt and bitter spite. One second he is crying over memories and burning her pictures, and the next he is furious that she turned his mood "de feliz a depre'" ("from happy to depressed," using the short slang depre). He even brings family into it, whining that "mi 'amá te quiso también" ("my mom loved you too"). In the end, he does not wish her well, he does not wish her ill, he just wants to know where he failed while making sure she knows he hates her so much it physically hurts.