Propuesta translates to "proposal" or "proposition". It's a word that immediately creates a sense of intrigue and suspense.
In the song, Maluma sings "Tres de la mañana, yo te tengo una propuesta" (Three in the morning, I have a proposal for you). This isn't a marriage proposal; coming at 3 AM, it implies a bold and tempting offer to convince a girl she should leave her boyfriend for him. This clever use of a formal-sounding word in a late-night, flirtatious context is what makes it so catchy and memorable.
Have you ever tried to convince someone they're with the wrong person? That's exactly what Colombian superstar Maluma is doing in "11 PM." The song unfolds over a few late-night hours as he waits for a woman to reply to his messages. He's making his move, telling her, "Cómo hacerte entender / Que conmigo tú te ves mejor" (How to make you understand / That with me you look better).
His argument is pretty direct. He tells her she's way too good for the guy she's with, saying, "Eres muy bonita para llorar por él" (You're too pretty to cry for him). He contrasts her neglectful boyfriend, who is a "nube que no deja ver el sol brillante" (cloud that doesn't let the bright sun be seen), with the life he can offer. And what a life! He promises luxury, suggesting, "Que en mi carro tú te ves mejor" (That in my car you look better) and that with him, "El cuarto huele a Christian Dior" (The room smells like Christian Dior). It's a bold proposal made in the middle of the night.