Ni se diga más is a popular Spanish phrase that literally means "let nothing more be said". It's the perfect equivalent of the English expression "say no more", used when something is so obviously good or true that it needs no further explanation.
In the song, the singer is praising his love's beauty. After mentioning her ojitos (little eyes), he adds "ni se diga más", implying her eyes are so captivating that they leave him speechless. It's a cool, conversational phrase that perfectly captures a feeling of being overwhelmed by beauty.
Emmanuel Cortes drops all his defenses in this Norteño track, giving us a totally unfiltered look at someone who is head-over-heels in love. Right from the start, he confesses that simply looking at her smile completely disarms him: "Cuando veo tu sonrisa / Y es lo que me debilita" ("When I see your smile / And it's what weakens me"). Instead of playing it cool, he asks her out on a date and wants to show her all the affection he has stored up. He loves her down-to-earth personality just as much as her looks, calling her "tan sencilla" ("so simple" or "unpretentious") and declaring her completely perfect.
Throughout the lyrics, Cortes uses classic terms of endearment like "mami" (literally "mommy", but used conversationally here as "babe" or "sweetheart"), "chiquitita" ("little one"), and "mija" (a contraction of mi hija, meaning "my daughter", but used casually to mean "dear" or "girl"). When he talks about her appearance, he mentions her beautiful body and trails off when describing her eyes with "esos ojitos, ni se diga más" ("those little eyes, say no more"). To him, the whole relationship feels like a fairy tale—"Nuestra historia es un cuento" ("Our story is a fairy tale")—and he is not shy about shouting out his own name ("Puro Emmanuel Cortes") while putting his heart on the line.