Jangueo is quintessential Puerto Rican slang, derived directly from the English phrase "hanging out". It's a cornerstone of reggaetĂłn culture, meaning to party, chill, or hang out with friends.
In "Un Verano Sin Ti", Bad Bunny uses it to show how heartbroken he is. He sings "yo casi no jangueo" (I almost never hang out) to explain that while he's normally a homebody, the pain of the breakup now pushes him to go out every night just to distract himself.
Un verano sin ti is such a good song
Bad Bunny is a legend