Ensaya comes from the verb ensayar, which means "to rehearse" or "to practice". It's a word you might associate more with a play or a band than a romantic encounter, which makes its use here so unique.
In the song, Manuel Turizo sings, "Pero un beso robado no se ensaya" (But a stolen kiss isn't rehearsed). This beautiful, poetic line captures the spontaneity and passion of an unplanned moment, suggesting that some of the best romantic moments can't be practiced.
Imagine you're at a party and the vibe is perfect. That's the scene Manuel Turizo sets in "Antes Que Te Vayas." He's only there because he saw someone special, telling them, "Eres el motivo por el cual esta noche quise salir" (You're the reason I wanted to go out tonight). He's completely focused on this person and feels like time is running out before they leave.
This song is all about seizing the moment. Before the night ends, he has a plan: he wants to "bailar contigo hasta la última canción" (dance with you until the last song) and "robarte un beso y después pedir perdón" (steal a kiss from you and then ask for forgiveness). He's very clear that this is just for one night. He doesn't even know their name, but he's sure the feeling is mutual. He promises that after this night, their time together will just be a fun memory, a "TBT" (Throwback Thursday).