Diabla literally translates to "she-devil". This word is often used in Latin music not as an insult, but as a term of endearment for a woman who is wild, passionate, and irresistibly seductive.
In "Regresa Mami", the artist sings "Mi cama te extraña tú cuerpo de diabla" (My bed misses your she-devil body). He uses this evocative word to reminisce about his ex-lover's fiery personality and the intense passion they shared.
This song is one big, sad plea for an ex to come back. The singer feels completely lost without her, singing, "Afuera nublado me siento atrapado / Porque tú no estás aquí" (It's cloudy outside, I feel trapped / Because you're not here). He's stuck remembering everything they had, which he calls "un amor que era perfecto" (a love that was perfect). They were a team, he says, and now he's just unhappy.
He remembers all the details, from sweet moments on the beach to wild nights partying on a boat in Miami with expensive champagne. He misses her "cuerpo de diabla" (devilish body) and how she would dance like crazy when they went out. Now, all he has are photos and videos, and he's convinced he can't live without her, ending the chorus with a desperate cry: "Regresa mami" (Come back, baby).