Cucha is a colloquial and affectionate term for 'mother' or 'mom' in some Spanish-speaking regions, particularly Colombia where Maluma is from. It's a more intimate and less formal way of saying 'madre'.
In the song, the line "La cucha pregunta por ti" (Mom asks about you) adds a touch of personal vulnerability and shows the depth of the singer's heartbreak. It highlights that his pain is so evident that even his mother notices the absence of his loved one, making it a unique and emotionally resonant word in the lyrics.
Maluma spends this whole song at the bar, and he wants you to know it's fine. "No te preocupes si me ves de bar en bar, eso es normal" (Don't worry if you see me from bar to bar, that's normal), he opens, then explains the system: "Para una gente es una distracción, pa' mí es un hospital" (For some people it's a distraction, for me it's a hospital). The joke lands because he means it. He is not out celebrating. He is checking himself in.
The plan he gives the waiter is the funniest and the saddest line here: "Te saco de mi mente o me sacan del bar" (I get you out of my mind or they kick me out of the bar), "Lo que pase primero" (Whatever happens first). It does not work, and he already knows it will not, which is why the chorus ends on "Mañana vuelvo y trato" (Tomorrow I'll try again). Between the drinks he lets slip the detail that gives him away: "La cucha pregunta por ti" (My mom asks about you), a very Colombian way of admitting his family had started counting on her too.