Magua is a beautiful word from the Canary Islands that doesn't have a perfect English equivalent. It describes a deep feeling of sadness, melancholy, and longing for something you've lost or miss dearly.
In the song, Quevedo sings, "me estaba dando la magua" (I was starting to feel the magua) after returning from a tour. This single word perfectly captures the homesickness and profound love for his island that is the central theme of the song, explaining why he wouldn't leave, not even drunk ("ni borracho").
This song is a massive love letter to Quevedo's home, the Canary Islands. He starts by joking that he looks terrible in the mirror from partying too much and that he needs to move away "si quiero llegar a viejo" (if I want to grow old) because the island is full of beautiful women and good rum. But the whole point of the song is that he would never actually leave. He shouts out the famous carnivals, the local slang like "Chacho, chacho" (dude, dude), and even the colors of the Canarian flag.
He repeats over and over that he's traveled the world—he's been to Paris and Miami and all over Spain—but he wouldn't trade his home for anywhere else. The title says it all: "no me mudo ni borracho" (I wouldn't move even if I were drunk). The song is packed with references to specific towns, festivals, and inside jokes from the islands, making it a super personal and proud anthem about where he comes from.