Aguardiente literally translates to "firewater" and refers to a strong alcoholic spirit, often clear and potent. It's a less common word than tequila or rum, making it more interesting for learners.
In the song, the singer lists various alcoholic beverages (tequila, fernet, wine, champagne, rum, whisky, cerveza) only to declare that none of them are the reason for his immense happiness. Aguardiente stands out as a unique and evocative term for a strong drink, adding to the song's playful dismissal of external factors for joy.
"Estoy Contento" ("I'm Happy") does exactly what its title promises: Ricardo Montaner joins the cumbia group La Sonora Santanera and spends the whole song naming reasons to be happy, no metaphors required. He starts simple, "Porque eres mía" (Because you're mine), "Porque soy tuyo" (Because I'm yours), then keeps going: her face, her body, the way she dresses. The best verse works by elimination. He rules out a whole bar of drinks, "No es el tequila... no es el fernet... ni el vino tinto ni el champan... no es la chevecha" (It's not the tequila, it's not the fernet, nor the red wine nor the champagne, it's not the beer), before finally landing on "por vivir así no mas" (just from living like this). Ruling out getting drunk before admitting he's simply glad to be alive is a funny way to build a love song.
By the end it drops the love song altogether and turns into a straight party record: a repeated call and response about "Como mueve el cuerpo" (how she moves her body), with La Sonora Santanera's own name getting a shoutout mid track. It's built for dancing, not for listening quietly, which suits a cumbia far better than heartbreak would.