Purunguita is a unique and playful term of endearment, likely a made-up or very regional pet name the artist uses for his beloved. It doesn't have a direct translation, but it's similar to calling someone 'my little thing' or 'my sweetie' in English.
This kind of creative nickname is common in Spanish and shows the personal, affectionate side of the language. In the song, 6ix9ine cries out "Ay, mi purunguita, yo te extraño demasiado" (Oh, my purunguita, I miss you so much), making it a key word to understand his deep sense of longing.
This song is a full-on heartbreak anthem. 6ix9ine wakes up alone, remembering his ex's kisses and affection, and immediately feels "solo y vacío" [lonely and empty]. He's completely lost, asking himself, "¿Y ahora, ¿qué hago?" [And now, what do I do?]. He's been texting and calling her over and over, but she's not answering, which leaves him wondering, "Diablo, ¿qué hice?" [Damn, what did I do?]. It's a classic post-breakup spiral where he can't figure out what went wrong.
He feels like a total fool, saying he's "un bobo aquí sufriendo" [a fool here suffering] while she's out enjoying her life. He even calls her a "bala perdida" [a stray bullet] for the damage she's done to his heart. He tries to put on a brave face, drinking with his friends, but he can't stop thinking about her. The song ends with a little warning, a hope for some karma: "el que ríe primero / Queda llorando y al final del cuento" [he who laughs first / ends up crying at the end of the story].