Ahogándome is a powerful, visual word that translates to "drowning myself". It combines the verb ahogar (to drown) with a suffix that indicates an ongoing action happening to oneself.
In the song, the artist sings, "En el tequila ahogándome" (Drowning myself in tequila). He uses this dramatic metaphor to describe how he's trying to escape the pain of his breakup, creating a vivid image of someone completely overwhelmed by sorrow and alcohol. It's a perfect example of how Spanish can express intense emotion in a single, compact word.
This song is one big, desperate text message sent on a dying phone battery. The singer is down to his last bit of power, his "un por ciento" [one percent], and he's using it to tell his ex how sorry he is. He knows he messed up. He sees her thriving on social media, looking happy with no more "días grises" [gray days], and it hurts because he's the opposite. He's miserable, telling her straight up, "Eso de que me vieron feliz, no, no es cierto" [That thing about them seeing me happy, no, it's not true].
He's tried to move on, but it's not working. He goes out with someone else, and she's wearing the perfume his ex likes. He gets drunk and looks at her Instagram. He admits he's living in a hell he created himself, "un infierno que yo mismo incendié." The whole song is a last-ditch effort, a confession sent from a bar while he's drowning his sorrows in tequila, hoping for a reply before his phone dies completely.