Provocar means "to provoke," but in romantic contexts like this song, it often takes on a lighter, more playful meaning, closer to "to tease" or "to entice."
In the lyrics, Alvaro Soler sings, "Loca, loca, loca cuando me provoca" (Crazy, crazy, crazy when she teases me). He uses this word to describe how his love interest's actions make him lose his reason, perfectly capturing the song's theme of thrilling, irresistible attraction.
Spanish pop star Alvaro Soler is completely head-over-heels in this track, and he is not trying to hide it. The song is all about an intense, dizzying infatuation that makes him ignore every bit of common sense. He admits right away in the chorus, "Pierdo y pierdo la razón" ("I lose and lose my mind"), whenever this person teases or tempts him ("cuando me provoca"). His friends even try to stage an intervention, telling him "tú no me haces bien" ("you are no good for me"), but he simply does not care. A single morning kiss ("regálame un beso, sólo por eso vale la pena" / "give me a kiss, just for that it is worth it") is enough to make all the chaos worth the trouble.
Language learners will pick up some great everyday spoken Spanish here, especially casual shortcuts like "vente pa' la cama" ("come to bed"), where pa' is the everyday spoken contraction of para. Soler also uses the phrase "te quiero con locura" ("I love you like crazy" or literally "with madness"), doubling down on the song's title, Loca (crazy). He cannot sleep without her ("sin ti yo no puedo dormir"), and he cannot stand the thought of waking up to find she slipped away alone ("no quiero verte irte sin mí"). It is fun, catchy, and shamelessly obsessed.