Macana literally translates to "club" or "cudgel", a blunt weapon. However, in some Latin American slang, it can refer to a penis, or more broadly, to something difficult or annoying.
In the context of "Expectativas que me sudan la macana" (Expectations that make my macana sweat), the artist is using a vulgar, colloquial expression to convey that expectations are making him extremely anxious or stressed, to the point of sweating from his penis. This vivid and somewhat crude imagery makes the word memorable and highlights the artist's raw, unfiltered expression.
"3AM" is a swaggering Spanish trap song built on comic-book bravado. The singer compares himself to a samurai carrying a katana, name-checks a comic villain, and drops references to Maradona and a champion boxer to paint himself as untouchable.
Underneath the flexing sits a real contradiction. The hook keeps repeating that he has nothing and needs nothing, even while the verses list watches, status, and confidence. That tension between having it all and wanting for nothing is the emotional core of the song.
By the end, the clock hits 3 AM and the mood turns loose and celebratory, closing out with a repeated chant to his girl, a victory lap after a night of proving himself.