Loquera is a colloquial term for "craziness", often referring to a wild party or a period of reckless behavior. It's a more informal and intense version of the common word locura (madness).
In the song, Gabito Ballesteros sings about "cuatro días de loquera" (four days of a wild spree) to try and forget his heartbreak. This word vividly paints a picture of him trying to escape his painful feelings, making it a powerful and memorable part of the lyrics.
This song is a brutally honest look at a guy who is completely falling apart after a breakup. The title itself means "Lost," and that's exactly how he feels. He's begging his ex, "Ven, dame una noche más" [Come, give me one more night], because he's stuck thinking about the past and how much it hurts that she's gone. He's haunted by memories like "Las fotos en el baño" [The photos in the bathroom] and deleted messages.
His way of coping is pretty self-destructive and, honestly, a total mess. He admits to partying for "cuatro días de loquera" [four days of craziness] and trying to distract himself with other women, but he says, "triste que no te llega" [sad that she's not you]. Nothing works. He feels so hurt, "bien dolido," that he's just "tomando nomás por tomar" [drinking just to drink]. In the middle of all this chaos, he's still romantic enough to pray to God on his knees, asking for a chance to win her back with the moon and the sea as a backdrop. It's a song about being completely wrecked by heartbreak.