Endulza literally means "to sweeten". It comes from the Spanish word for sweet, dulce.
In the song, the lyric is "Endulza hasta el agua salada" (She sweetens even the salt water). This is a beautiful and poetic hyperbole used to describe how incredibly charming and captivating a woman is. It suggests her presence alone can magically transform something fundamentally bitter into something sweet.
"Julieta" by Mexican artist Latin Mafia is an ode to a mesmerizing girl who commands every pair of eyes in the room the second she steps onto the floor. The singer falls under her spell over a single glass of wine and quick small talk: "Con sólo una copa de vino / Y una breve charla" [With just a glass of wine / And a brief chat]. She moves effortlessly—"Se te facilita como el caminar" [It comes as easy to you as walking]—and the beat builds from slow to intense ("Poco a poco se va a violento" [Little by little it gets violent]), pulling them straight toward the dance floor.
What makes the track so catchy is its playful, late-night attitude. Latin Mafia describes her as magnetic enough to "Endulza hasta el agua salada" [Sweeten even salt water], but warns that she is strictly on her own terms ("No hay reclamos porque no hay llamadas" [There are no complaints because there are no phone calls]). When he drops the line "La gente está bellaqueando", he uses the Latin urban slang bellaquear (to grind, flirt, or dance seductively at a party). She sips "su te de cerecita" [her little cherry tea] and Tamarind liqueur, completely unbothered by everyone watching, while he brushes off the gossipers with a blunt "La gente siempre critica, perros" [People always criticize, dogs].