Se me vuelve un ocho is a fantastic Spanish idiom that literally translates to "it turns into an eight for me". The phrase is used to say that something has become a complete mess or is all tangled up, like the looping shape of the number 8.
In the song, Shakira sings "la vida se me vuelve un ocho" (my life becomes a mess) to express the utter chaos and confusion she feels without her love. It's a creative and visual way to describe how her world falls apart when they're not there.
Before she crossed over into global English hits, Colombian pop star Shakira wrote clever, frantic love songs like this one. In "Dónde Estás Corazón" (Where are you, sweetheart?), she turns the panic of missing an ex into an obsessive, almost comical scavenger hunt. Her world is completely upside down without them: she sings "la vida se me vuelve un ocho" (life turns into a figure eight / life becomes a mess), a great Colombian idiom for things getting tangled into chaos. She suspects her lover ran off "buscando quien sabe que cosas tan lejos de mí" (looking for who knows what so far away from me), yet she still insists nobody else on the planet is worth loving.
The real joy of the track comes when Shakira rattles off a breathless list of absurd places she has searched. She checks ordinary hiding spots like "en el armario" (in the closet) and "debajo del carro" (under the car), but then jumps straight into the surreal: "en el abecedario" (in the alphabet), "en dos mil religiones" (in two thousand religions), and even "en mi monedero" (in my coin purse). She also nods to her home country by looking "en cuadros de Botero" (in paintings by Botero), referencing Fernando Botero, the famous Colombian artist known for painting round, exaggerated figures. It is dramatic, fast, and wonderfully ridiculous: she looks everywhere from history books to her mother-in-law's house just to find the person who walked out.