Madrugándome is a fascinating and somewhat playful use of the verb madrugar, which means "to wake up early" or "to get an early start". The reflexive form madrugándome here implies the act of the subject doing this to themselves.
In the context of the song, the artist is not just waking up early, but rather staying up all night or pulling an all-nighter, specifically in the same club where he used to be with his ex-lover. It conveys a sense of self-inflicted emotional pain and a desperate attempt to relive or forget memories, making it a unique and emotionally charged word choice.
Have you ever tried to forget someone but ended up remembering them even more? In "Un Shot," Arcángel takes us to a nightclub, a place filled with memories of a past love. He finds himself trying to numb the pain of a breakup by taking shots of alcohol. But instead of helping him forget, each drink only brings back more vivid memories: the feeling of his ex's warmth, dancing in the dark, and intimate moments they shared.
As the night goes on and the drinks keep flowing, the singer feels like he's losing control. He's trying to heal his emotional "wounds" with alcohol, but it's a losing battle. He's stuck in a loop, thinking about the person who left him "in the dark" and hoping to drink until the "tape is erased" and the memories finally fade away. The song paints a powerful picture of heartbreak and the struggle to move on when everything reminds you of what you've lost.