Debrayar is a fantastic, somewhat informal verb that means "to go crazy," "to rave," or "to get wild." It's not a word you hear every day, making it quite memorable.
In "La Fiesta," Aleks Syntek uses it to describe the party reaching an intense, almost chaotic level of fun: "Yo siento que la fiesta va a debrayar" (I feel like the party is going to go wild). It perfectly captures the energetic and uninhibited atmosphere of the song.