Trágame comes from the verb tragar (to swallow). It's part of the dramatic Spanish idiom ¡Trágame tierra!, which literally translates to "Earth, swallow me!"
This powerful phrase is used to express an overwhelming desire to disappear from a situation, often due to extreme embarrassment or, in this case, unbearable heartbreak. In the song, Selena cries out "Mátame cielo, trágame tierra" (Kill me, heaven; swallow me, earth), conveying the absolute depth of her despair over a lost love. It's a poetic and intensely emotional expression you won't find in many songs.
Selena goes full dramatic heartbreak in this Tejano track, and she does not hold back. Her heart is literally fading away like dusk: "Ya está muriendo, tarde con tarde / Como se muera la luz del día" ("It is dying, afternoon after afternoon / Like daylight dies"). She begs her ex to return, stacking up affectionate pet names like "alma de mi alma" ("soul of my soul") and "vidita mía" ("my little life"). Then comes the sheer desperation. She sings "Mátame cielo, trágame tierra" ("Kill me, heaven; swallow me up, earth"), using a classic Spanish idiom—trágame tierra—which is what you shout when you want the ground to open up and swallow you whole from pure agony or embarrassment. Here, without her love, she would honestly rather die.
Still, she manages to throw a cold curse right back at them. She admits her ex might find someone else and hold the world in their hands: "Ya podrás tener el mundo entero... Y otro cariño, mejor que el mío" ("You may have the whole world... and another sweetheart, better than mine"). But she promises that honeymoon phase will crash and burn. Her warning is blunt: "Y al verte solo, como hoy me siento / Siempre hace frío" ("And seeing yourself alone, like I feel today / It is always cold"). It is a bitter, petty promise that no matter how good they think they have it now, solitude will freeze them out eventually.