Sepultura literally means "burial" or "grave" in Spanish. It is a heavy, dramatic word rarely heard in everyday speech, so hearing it in a song immediately grabs attention and adds weight to the line.
Here it's used as a provocative double meaning: "Ese culo está buscando que le dé sepultura" ("That ass is looking for a burial"), turning a funeral word into a bold, sexual joke about intensity rather than death.
Hades66's "Bbsita Te VeS Bien" is a super direct and confident track where the artist is completely captivated by someone. He starts right off the bat asking, "Bebecita, te ves bien / ¿Cómo te va? ¿Cómo te ha ido? Dime / Si todavía tú eres mi friend / O quisiera' que fueramo' más que amigos" [Baby, you look good / How are you? How have you been? Tell me / If you're still my friend / Or if you'd like us to be more than friends]. He's not shy about wanting more than just friendship!
He really lays it all out, saying things like "Yo quiero darte castigo" [I want to punish you] and "Comerte lo que tienes debajo del ombligo" [Eat what you have below your belly button], which are pretty bold and explicit ways to express his desire. He even uses some fun anime references, comparing her movements to Sakura and saying she sees him like Hinata, showing he's really into her. The song is all about that intense attraction and his very clear intentions.