Ahogues is from the verb ahogar, which literally means "to drown". It's a dramatic and powerful word that creates a strong visual image.
In the lyrics, Selena Gomez uses it metaphorically, singing "No me ahogues con palabras" (Don't drown me with words). She's expressing that her ex's attempts to talk to her are overwhelming and suffocating. This poetic phrase vividly captures the feeling of being emotionally overwhelmed and wanting someone's empty words to just stop.
Ever had an ex tell everyone they are completely over you, only to ring your phone in the middle of the night? That exact hypocritical mess is what Selena Gomez tackles in "Adiós". Her ex's friends swear he is thrilled to be single, yet he keeps blowing up her phone at 3:00 AM asking jealous questions. Selena shuts that down fast with "yo ya te olvidé" ("I already forgot about you"). She even tells him that her latest social media post is not a secret signal: "esta no es pa' ti / La foto que subí" ("this isn't for you / the photo I uploaded"). She has moved on, she is sleeping with whoever she wants, and she has zero interest in explaining herself.
What makes the track fun is how brutally practical the Spanish slang gets. When she sings "si te dejo en visto, pa' qué llamas" ("if I leave you on 'read', why are you calling?"), she calls out the ultimate modern boundary violation. Dejar en visto literally means leaving someone on "seen" in messaging apps, and it means the conversation is dead. Then she drops "Bájale, bájale" ("bring it down, chill out"), telling him to lower his attitude and back off. It is cold, clear, and makes you smile: she does not hate him, she is just totally bored of his drama.